Paradigm® REAL-Time Revel™ MMT-523NAL (UDI 00643169202320)Recalls & reported problems

Summary

The FDA's MAUDE database contains 154 adverse event reports that list this exact device (DI 00643169202320), received between Jun 5, 2017 and Aug 12, 2020 — classified as 1 death, 45 injuries, 108 malfunctions.

The most frequently reported specific device problem is “Device Displays Incorrect Message” (26 reports).

14 other recalls cover devices cleared under the same FDA submission (P980022); they may or may not involve this specific model.

Reports come from manufacturers, hospitals and patients and are not verified by the FDA. A report does not prove the device caused the event, and counts can't be used to compare devices or estimate failure rates. What reports can and can't tell you · How this data works · Data updated Oct 18, 2026.

Most reported problems

Recent adverse event reports

The 25 most recent of 154 reports, in the reporter's own words as published by the FDA.

• MalfunctionAug 12, 2020Premature Discharge of Battery; Premature Discharge of Battery

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP RECEIVED UNEXPECTED RESTART ALARM DURING BATTERY CHANGE. IT WAS UNKNOWN IF THE CUSTOMER WAS ABLE TO CLEAR THE ALARM. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 10395613 ↗
• MalfunctionAug 11, 2020Mechanical Problem; Mechanical Problem

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP HAD MOTOR ERROR. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 10389920 ↗
• MalfunctionJul 16, 2020Failure to Cycle; Failure to Cycle

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP HAD A COMPROMISED FORCE SENSOR SYSTEM ALARM. THE DEVICE WAS STUCK IN THE REWIND PROCESS AND UNABLE TO COMPLETE THE PROCESS. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 10281647 ↗
• MalfunctionJul 14, 2020Failure to Cycle; Detachment of Device or Device Component; Failure to Cycle; Detachment of Device or Device Component

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP HAD COMPROMISED FORCE SENSOR SYSTEM ALARM. CUSTOMER STATED INSULIN PUMP WAS NOT DROPPED NOR BUMPED PRIOR TO THE ALARM. CUSTOMER STATED THAT THE DRIVE SUPPORT CAP WAS STICKING OUT. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE DEVICE WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 10269100 ↗
• MalfunctionJun 24, 2020Failure to Cycle; Failure to Cycle

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP ALARMED COMPROMISED FORCE SENSOR SYSTEM. CUSTOMER STATED DRIVE SUPPORT CAP WAS APPEARS NORMAL. CUSTOMER STATED INSULIN WAS SQUIRTING OUT DURING THE MANUAL PRIME PROCESS. TROUBLESHOOTING WAS PERFORMED. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 10188003 ↗
• MalfunctionJun 22, 2020Insufficient Device Problem Information; Insufficient Device Problem Information

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP HAD INSULIN PUMP ERROR. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 10178271 ↗
• MalfunctionMay 21, 2020Premature Discharge of Battery; Device Difficult to Program or Calibrate; Visual Prompts will not Clear; Premature Discharge of Battery; Device Difficult to Program or Calibrate; Visual Prompts will not Clear

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THEIR INSULIN PUMP HAD UNEXPECTED RESTART ALARM, KEYPAD ANOMALY AND FROZEN DISPLAY. CUSTOMER WAS UNABLE TO CLEAR ALARMS. CUSTOMER REPORTED THAT THE TIME CLOCK WAS ADVANCED. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 10078247 ↗
• MalfunctionApr 17, 2020Device Difficult to Program or Calibrate; Patient Device Interaction Problem; Device Difficult to Program or Calibrate; Patient Device Interaction Problem

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE PIECE OF THREAD IN RESERVOIR COMPARTMENT WAS FALLING OFF AND BOLUS BUTTON WAS STUCK. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9970824 ↗
• MalfunctionMar 23, 2020Premature Discharge of Battery; Premature Discharge of Battery

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP HAD UNEXPECTED RESTART ALARM. CUSTOMER REPORTED THEY WERE ABLE TO CLEAR THE ALARM. CUSTOMER REPORTED PUMP DID REQUIRE REWIND. CUSTOMER ABLE TO COMPLETE REWIND. CUSTOMER WAS CALLING BACK FOR RECEIVING ANOTHER UNEXPECTED RESTART ALARM AFTER A BATTERY CHANGE. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9864146 ↗
• InjuryMar 12, 2020Excess Flow or Over-Infusion; Connection Problem; No Apparent Adverse Event; Patient Device Interaction Problem; Excess Flow or Over-Infusion; Connection Problem; No Apparent Adverse Event; Patient Device Interaction Problem

  THE CUSTOMER¿S MOTHER REPORTED VIA PHONE CALL THAT CUSTOMER WENT PASSED OUT. CUSTOMER STATED BATTERY COMPARTMENT AND RESERVOIR OPENINGS WERE DAMAGED AND THE RESERVOIR WAS NOT STAYING IN THE INSULIN PUMP. CUSTOMER STATED INSULIN PUMP WAS OVER DELIVERING. TROUBLESHOOTING WAS PERFORMED. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: Hypoglycemia; Loss of consciousness

  MAUDE report 9823474 ↗
• InjuryMar 5, 2020Patient Device Interaction Problem; Patient Device Interaction Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THEY WERE HOSPITALIZED DUE TO HIGH BLOOD GLUCOSE ON (B)(6) 2020 WITH BLOOD GLUCOSE OF 720 MG/DL. CUSTOMER WAS TREATED WITH INSULIN DRIP. IT WAS ALSO REPORTED THAT THE INSULIN PUMP WAS DAMAGED AND THERE WAS BIG CRACK ON INSULIN PUMP HOWEVER THERE WAS NO DAMAGED ON RESERVOIR LIP RING. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: Hyperglycemia

  MAUDE report 9791541 ↗
• InjuryJan 29, 2020Failure to Cycle; No Apparent Adverse Event; Failure to Cycle; No Apparent Adverse Event

  IT WAS REPORTED BY CUSTOMER¿S DAUGHTER VIA PHONE CALL THAT THEY WERE HOSPITALIZED ON (B)(6) 2020 DUE TO HIGH BLOOD GLUCOSE AND DIABETIC KETOACIDOSIS. BLOOD GLUCOSE LEVEL WAS 500 MG/DL AT THE TIME OF ADMISSION. CUSTOMER WAS TREATED WITH INSULIN DRIP WHILE IN THE EMERGENCY ROOM. CUSTOMER ALSO REPORTED THAT THE INSULIN PUMP HAD COMPROMISED FORCE SENSOR SYSTEM ALARM. CUSTOMER STATED THAT THE DRIVE SUPPORT CAP WAS NORMAL. THE CUSTOMER WAS STILL IN THE HOSPITAL AT THE TIME OF THE CALL AND COULD NOT TROUBLESHOOT DUE TO THE ALARM. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: Elevated Ketones/ Diabetic Ketoacidosis; Hyperglycemia

  MAUDE report 9645439 ↗
• MalfunctionJan 29, 2020Premature Discharge of Battery; Loss of Data; Premature Discharge of Battery; Loss of Data

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP HAD MULTIPLE INSULIN PUMP ERROR ALARM. CUSTOMER STATED THEY WERE ABLE TO CLEAR THE ALARM AND THEY WERE ABLE TO REWIND INSULIN PUMP. CUSTOMER STATED THEY RECEIVED MULTIPLE UNEXPECTED RESTART ALARM AFTER INSERTING NEW BATTERY. TROUBLESHOOTING WAS PERFORMED. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9640537 ↗
• MalfunctionDec 19, 2019Wireless Communication Problem; Wireless Communication Problem

  THE CUSTOMER'S MOTHER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP HAD RF PIC FAILED SELF TEST ALERT. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS UNKNOWN. THE DEVICE WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9493382 ↗
• MalfunctionDec 9, 2019Premature Discharge of Battery; Display or Visual Feedback Problem; Device Difficult to Program or Calibrate; Premature Discharge of Battery; Display or Visual Feedback Problem; Device Difficult to Program or Calibrate

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP HAD UNEXPECTED RESTART ERROR. CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS 209 MG/DL. CUSTOMER REPORTED THAT THE SCREEN WAS FLASHING AND BUTTON WAS NOT REACTING. CUSTOMER DECLINED TO TALK WITH SERVICE REPRESENTATIVE. CUSTOMER REPORTED THAT THEY WERE NOT ABLE TO CLEAR THE ALARM. THE CUSTOMER WAS ADVISED TO DISCONTINUED THE INSULIN PUMP AND REVERT TO BACKUP PLAN. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9437302 ↗
• MalfunctionNov 27, 2019Connection Problem; Patient Device Interaction Problem; Connection Problem; Patient Device Interaction Problem

  CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP HAD COSMETIC DAMAGE AND LIP RING FROM RESERVOIR CAME OFF. CUSTOMER'S BLOOD GLUCOSE LEVEL WAS UNKNOWN. CUSTOMER STATED THAT THE RUBBER ON RESERVOIR COMPARTMENT CAME OFF. CUSTOMER REPORTED THAT RESERVOIR WAS UNABLE TO LOCK IN PLACE WHEN INSERTED INTO INSULIN PUMP. CUSTOMER WAS ADVISED TO REVERT TO BACKUP PLAN. INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9380589 ↗
• MalfunctionNov 26, 2019Patient Device Interaction Problem; Patient Device Interaction Problem

  CUSTOMER REPORTED VIA PHONE CALL THAT THE CRACKS ON THE SCREEN AND RESERVOIR. CUSTOMER'S BLOOD GLUCOSE LEVEL WAS UNKNOWN AT THE TIME OF THE INCIDENT. THE DEVICE WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9375003 ↗
• InjuryNov 19, 2019Connection Problem; Connection Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THEY EXPERIENCED HIGH BLOOD GLUCOSE AND RESERVOIR WAS NOT ABLE TO LOCK INTO PLACE. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS 527 MG/DL. CUSTOMER STATED THAT THE PIECE WAS MISSING AT THE RESERVOIR. THE CUSTOMER WAS ADVISED THAT THE INSULIN PUMP NEEDED TO BE REPLACED AND WAS ADVISED TO DISCONTINUE USE OF THE INSULIN PUMP AND TO REVERT TO THE BACKUP PLAN. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: Hyperglycemia

  MAUDE report 9345640 ↗
• MalfunctionNov 14, 2019Device Difficult to Program or Calibrate; Device Difficult to Program or Calibrate

  THE CUSTOMER¿S PARENT REPORTED VIA PHONE CALL THE INSULIN PUMP ALARMED BUTTON ERROR. THE CUSTOMER¿S BLOOD GLUCOSE WAS UNKNOWN AT THE TIME OF INCIDENT. CUSTOMER¿S PARENT STATED THAT THE INSULIN PUMP ALARMED BUTTON ERROR AND UNABLE TO CLEAR THE ALARM. NO SIGNIFICANT EVENTS LEADING TO BUTTON ERROR WERE OBSERVED. BUTTON ERROR TROUBLESHOOTING WAS PERFORMED AND CONFIRMED THAT TIME IS ADVANCING. THE CUSTOMER¿S PARENT WAS ADVISED TO HAVE THE CUSTOMER DISCONTINUE USE OF PUMP AND REVERT TO BACK-UP PLAN. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9320582 ↗
• MalfunctionOct 15, 2019Failure to Cycle; Priming Problem; Failure to Cycle; Priming Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT INSULIN PUMP SQUIRTED INSTEAD OF DRIPPED WHEN PRIMING, INSULIN PUMP FAILURE TO CONNECT AND HE HAD TO REDO THE INFUSION SETS SOMETIMES. THE BLOOD GLUCOSE WAS UNKNOWN. THE DEVICE WILL NOT BE RETURNED FOR THE ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9191029 ↗
• MalfunctionOct 9, 2019Failure to Cycle; Display or Visual Feedback Problem; Device Difficult to Program or Calibrate; Obstruction of Flow; Power Problem; Patient Device Interaction Problem; Priming Problem; Failure to Cycle; Display or Visual Feedback Problem; Device Difficult to Program or Calibrate; Obstruction of Flow; Power Problem; Patient Device Interaction Problem; Priming Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THEIR INSULIN PUMP HAD A SCRATCHES ON SCREEN MADE IT HARDER TO READ. THE CUSTOMER¿S BLOOD GLUCOSE WAS UNKNOWN. CUSTOMER REPORTED THAT THE RUBBER STOPPER ON BATTERY PORT WAS WEARING OUT, WHEN HE CHANGED BATTERY INSULIN PUMP WON'T COME BACK ON FOR UP TO AN HOUR AFTER THEN THE INSULIN PUMP REJECTED NEW BATTERIES. CUSTOMER ALSO REPORTED THAT THE INSULIN PUMP HAD A UNEXPLAINED NO DELIVERY ALARMS. CUSTOMER MENTIONED THAT THE BUTTONS WERE SO WORN OUT THAT THE PLASTIC WAS BROKE ON THE BOTTOM OF THEM. BUTTONS HAD TO PRESS 10 TO 15 TIMES TO ACTIVATE AND INSULIN SQUIRTED OUT DURING PRIMING. CUSTOMER ALSO INFORMED THAT THE BACKLIGHT WAS DIMMER. CUSTOMER DECLINED TO REPORT 24 HOURS TECHNICAL SUPPORT. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9170646 ↗
• MalfunctionSep 20, 2019Device Difficult to Program or Calibrate; Device Difficult to Program or Calibrate

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THEIR INSULIN PUMP HAD BUTTON ERROR. THE CUSTOMER¿S BLOOD GLUCOSE WAS 160 MG/DL AT THE TIME OF INCIDENT. CUSTOMER REPORTED THAT THE BUTTON PRESSED FOR MORE THAN 3 MINUTES. CUSTOMER WAS UNABLE TO CLEAR THE MESSAGE, BUTTONS WERE NO LONGER WORKING. CUSTOMER REPORTED THAT THE TIME CLOCK WAS ADVANCED. THE CUSTOMER WAS ADVISED THAT THE INSULIN PUMP NEEDED TO BE REPLACED AND WAS ADVISED TO DISCONTINUE USE OF THE INSULIN PUMP AND TO REVERT TO THE BACKUP PLAN AS PER HEALTH CARE PROFESSIONAL INSTRUCTION. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9097196 ↗
• MalfunctionSep 20, 2019Device Difficult to Program or Calibrate; Obstruction of Flow; Battery Problem; Patient Device Interaction Problem; Device Difficult to Program or Calibrate; Obstruction of Flow; Battery Problem; Patient Device Interaction Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP BUTTONS WERE STICKY. THE CUSTOMER'S BLOOD GLUCOSE VALUE WAS UNKNOWN. CUSTOMER STATED INSULIN PUMP HAD RANDOM NO DELIVERY ALERT AND SCRATCHES ON SCREEN MAKING HARD TO READ. CUSTOMER STATED INSULIN PUMP HAD RANDOM NO DELIVERY ALERT AND DIMINISHED BATTERY LIFE. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9096368 ↗
• MalfunctionAug 28, 2019Failure to Cycle; Failure to Cycle

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP ALARMED COMPROMISED FORCE SENSOR SYSTEM. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS 270 MG/DL AT THE TIME OF THE INCIDENT. THE CUSTOMER STATED THAT THE DRIVE SUPPORT CAP WAS PROTRUDED. THE CUSTOMER WAS ADVISED THAT THE INSULIN PUMP NEEDED TO BE REPLACED AND WAS ADVISED TO DISCONTINUE USE OF THE INSULIN PUMP AND TO REVERT TO THE BACKUP PLAN. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: Hyperglycemia

  MAUDE report 8938520 ↗
• MalfunctionAug 8, 2019Break

  THE CUSTOMER REPORTED VIA PHONE CALL INDICATING THAT THEIR INSULIN PUMP WAS DAMAGED. CUSTOMER STATED A PIECE CHIPPED OFF IN THE RESERVOIR AND BATTERY COMPARTMENT. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS 115 MG/DL AT THE TIME OF THE INCIDENT. THE CUSTOMER WAS INFORMED THAT THE INSULIN PUMP NEEDED TO BE REPLACED AND WAS ADVISED TO DISCONTINUE USE OF THE INSULIN PUMP AND TO REVERT TO THE BACK UP PLAN. THE CUSTOMER SENT THE PRODUCT BACK FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8876882 ↗

Recalls under the same FDA submission

These recalls involve devices cleared under P980022. One submission often covers many models, so check the product and lot details in each record.

• Z-1749-2026 · Feb 13, 2026 · Open, Classified
  Paradigm REAL-Time Insulin Pump (MMT-522, MMT-722)
• Z-1750-2026 · Feb 13, 2026 · Open, Classified
  Paradigm REAL-Time Revel Insulin Pump (MMT-523, MMT-723)
• Z-1256-2025 · Jan 31, 2025 · Open, Classified
  Paradigm insulin pump, REF: MMT-522, MMT-523, MMT-551, MMT-722, MMT-723, MMT-751
• Z-1587-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-522
• Z-1589-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-522K
• Z-1594-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-723
• Z-1593-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-723K
• Z-1592-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-523K
• Z-1588-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-722
• Z-1590-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-722K
• Z-1591-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-523
• Z-2442-2015 · Jul 22, 2015 · Terminated
  Guardian Real-Time Monitor, Model No. CSS7100. Indicated for continuous or periodic monitoring of glucose levels in the fluid under the skin, in adults (18 years and older) with d
• Z-2179-2014 · Jul 21, 2014 · Terminated
  Medtronic MiniMed Guardian Monitor, Model No. CSS7100, CSS7100K Product Usage: The Medtronic MiniMed model CSS7100 and CSS7100K Guardian REAL-Time monitors are used in combinatio
• Z-2544-2014 · Mar 13, 2014 · Terminated
  Medtronic MiniMed Paradigm Insulin Infusion Pumps, Paradigm models: MMT-511, MMT-512, MMT-712, MMT-712E, MMT-515, MMT-715, MMT-522, MMT-522K, MMT-722, MMT-722K, MMT-523, MMT-523K