USI Electric Hardwired 2-in-1 Universal Smoke Sensing Smoke and Fire Alarm with Battery Backup (MDS107)

  • USI Electric Hardwired 2-in-1 Universal Smoke Sensing Smoke and Fire Alarm with Battery Backup (MDS107)
2-in-1 | Smart Alarm

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  • Universal Smoke Sensing Smoke and Fire Alarm
  • Responds 87% Faster to Slow Smoldering Fires
  • Responds Quickest to Fast Flaming Fires
  • 120 Volt AC Wired-In + 9 volt Alkaline Battery Operated
  • Loud 85 db Alarm
  • Microprocessor Eliminates Nuisance Alarms
  • New Universal Smoke Sensing Technology
  • Power and Alarm LED's
  • Test/Silence Button
  • Product End-of-Service Life Warning
  • 2 Tamper Resistant Locking Features
  • Battery Activation Tab
  • Quick Draw Battery Drawer
  • Interconnectable with up to 24 Compatible Devices
  • Ideal for Homes, Apartments and Mobile Homes
  • Listed to UL217 Standard
  • California State Fire Marshal Approved
  • 10 Year Limited Warranty
The USI Electric MDS107 Smoke and Fire Alarm responds quickly to both fast-flaming and slow-smoldering fires to protect your family against deadly threats in the home. Perfect for new or replacement installations, the 120V AC hardwired alarm is suitable for houses, apartments and mobile homes. Universal Smoke Sensing Technology responds 87-percent faster to slow smoldering fires and responds quickest to fast-flaming fires. The alarm is fully interconnectable with all USI and Universal 120V alarms using existing wiring and mounting. Auto sensitivity calibration provides superior nuisance alarm protection and creates consistency in alarm sensitivity.

This alarm has additional automatic features including a self-diagnostics check to ensure proper operation, a sensitivity adjustment for changes in temperature or humidity and an end-of-service life warning that sounds when it's time to replace the battery. The 9-volt alkaline battery (included) continues protection in the event of a power outage. This alarm features a front-loading battery drawer for replacing the battery without removing the alarm from the bracket. Mount the bracket to any standard wiring junction box and use the large mounting base to cover imperfections in drywall. For maximum protection, install an alarm inside every bedroom, outside every sleeping area and on all levels of the dwelling. The USI Electric MDS107 Hardwired Universal Smoke Sensing Smoke and Fire Alarm comes with a 10 year limited warranty.
  • MPN: MDS107
  • UPC: 042741001076
  • Warranty: 10 year Limited Warranty
  • Alarms Power Source: 120 volt hardwired with battery backup (Battery Included)
  • Alarm Sensor Type: Universal Smoke Sensing Technology (Ionization & Photoelectric)
  • Manufacturing Credits: ISO 9001 certified factory, UL listed & CSFM listed
Click Here to Write a Review for this Product. Review

Average Customer Rating Based on 3 reviews: Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Easy replacements - 12/03/2016
Reviewer: Derek Fremd
Had 15-year old USI products and decided to replace as they were long overdue. Good price, fast shipment and super easy install.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Excellent - 06/03/2016
Reviewer: Robert Adamski
Great product - Had First Alert's in house and lots of problems. Replaced with USI and no more trouble


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Detectors - 11/28/2015
Reviewer: Jessica Troutt
We bought four at once and are very pleased. They shipped quickly and were easy to install.

Q: WHY DOES MY SMOKE ALARM 'CHIRP' APPROXIMATELY ONCE EVERY MINUTE?
A: The smoke alarm chirps to indicate a "low battery" condition, meaning the battery needs to be replaced. Battery powered smoke alarms will chirp a minimum of 30 days before the battery completely loses power.

AC powered smoke alarms with battery backup will chirp indefinitely assuming AC power is present; if battery power is low, or battery is removed; until a fresh battery is installed. Approved replacement batteries are listed on the back of each smoke alarm and in the user's manual.

Certain model smoke alarms with a silence button (designed to silence the alarm during a nuisance alarm) may chirp to indicate the smoke alarm is in the silence mode. The chirp will stop after approximately 8 minutes and the smoke alarm will return to its normal operation.




Q: WHAT DOES IT MEAN WHEN THE RED LIGHT ON THE ALARM FLASHES APPROXIMATELY ONCE EVERY MINUTE?
A: The flashing red light gives a visual indication that the smoke detector is functioning properly. It also indicates a working battery is connected to the smoke alarm.




Q: WHAT DOES THE CONTINUOUS GREEN LIGHT ON MY SMOKE ALARM INDICATE?
A: When a green light is present on your smoke detector, it means that AC power is currently operating the alarm.




Q: THE GREEN LIGHT ON MY SMOKE ALARM HAS GONE OUT, WHAT DOES THIS MEAN?
A: If the green light on your smoke detector is not on, it means the AC power has been interrupted to the alarm. Check the circuit breaker and AC wiring to make sure power is still reaching the smoke alarm.




Q: HOW CAN I TELL WHICH SMOKE ALARM IN A MULTI-STATION SYSTEM INITIATED THE ALARM?
A: When interconnected alarms are alarming, the smoke alarm which initiated the alarm, either by test button or sensing smoke, will flash the red LED light approximately once per second. The red LED light on the other non-initiated interconnected smoke detectors will not be lit but will sound the alarm.




Q: HOW MANY SMOKE ALARMS OR DEVICES CAN BE INTERCONNECT AT ONE TIME?
A: The NFPA 72 standard states the interconnect limit is 12 smoke alarms and up to 6 other alarms (heat alarms or carbon monoxide detectors) for a total of 18 total alarms. With 18 alarms interconnected, up to an additional 6 relay modules may be interconnected (for a maximum of 24 devices).

If battery backup alarms and non-battery backup alarms and accessories are mixed in an interconnect system, all devices without battery backup WILL NOT operate during an AC power failure.

CAUTION: USI alarms and accessories should only be interconnected with other USI alarms and accessories. Connecting devices from another manufacturer to USI devices may result in nuisance alarms, failure to alarm, or damage to one or all of the devices in the interconnect system. All interconnected USI alarms should be powered by the same fuse or circuit breaker. Smoke alarms shall not receive their power from a circuit that is protected by a ground fault circuit interrupter. Improper connection will result in damage to the alarm, failure to operate, or a shock hazard.





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