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  • Photoelectric Smoke and Fire Alarm
  • 120 Volt AC Wired-In
  • 9 Volt Battery Backup
  • Loud 85 db Alarm
  • Superior Nuisance Alarm Resistance
  • Test/Silence Button
  • Power and Alarm LED's
  • Product End-of Service Life Warning
  • Battery Activation Pull Tab
  • Quick Draw Battery Drawer
  • Super Heavy-Duty Battery Included
  • 2 Tamper Resistant Locking Features
  • Interconnectable with all USI and Universal 120V Alarms
  • Interconnectable with up to 24 Devices
  • Ideal for Homes, Apartments and Mobile Homes
  • Listed to UL217 Standard
  • California State Fire Marshal Approved
  • 10 Year Limited Warranty
Manuals
The USI Electric MP117 Hardwired Photoelectric Smoke and Fire Alarm responds quickly to slow-smoldering fires to protect your family against deadly threats in the home. Perfect for new or replacement installations, the 120-volt AC hardwired alarm is suitable for houses, apartments and mobile homes. This smoke and fire alarm is fully interconnectable with all USI and Universal 120V alarms using existing wiring and mounting. Quick Find alarm origination identifies the first detector to sound in an interconnected system and the single silence/test button temporarily quiets nonemergency alarms. This photoelectric alarm has additional automatic features including a self-diagnostics check to ensure proper operation, a sensitivity adjustment and an end-of-service life warning that sounds when it's time to replace the battery. The 9-volt battery (included) provides continuous protection in the event of a power outage.

This USI Hardwired Photoelectric Smoke and Fire Alarm features a quick activation pull-tab and a front-loading battery drawer for replacement 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. The plastic dust cover protects the alarm from debris and (2) tamper-resistant locks prevent unwanted alarm or battery removal. For maximum protection, install an alarm inside every bedroom, outside every sleeping area and on all levels of the dwelling. The USI Electric MP117 Hardwired Photoelectric Smoke and Fire Alarm comes with a 10 year limited warranty.
WHY DOES MY SMOKE ALARM 'CHIRP' APPROXIMATELY ONCE EVERY MINUTE?
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.
WHAT DOES IT MEAN WHEN THE RED LIGHT ON THE ALARM FLASHES APPROXIMATELY ONCE EVERY MINUTE?
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.
WHAT DOES THE CONTINUOUS GREEN LIGHT ON MY SMOKE ALARM INDICATE?
When a green light is present on your smoke detector, it means that AC power is currently operating the alarm.
THE GREEN LIGHT ON MY SMOKE ALARM HAS GONE OUT, WHAT DOES THIS MEAN?
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.
HOW CAN I TELL WHICH SMOKE ALARM IN A MULTI-STATION SYSTEM INITIATED THE ALARM?
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.
HOW MANY SMOKE ALARMS OR DEVICES CAN BE INTERCONNECT AT ONE TIME?
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.
Product Details
Product Specs
UPC:
042741001175
MPN:
MP117
Category:
Smoke Alarms
Product Manuals
USI Electric Hardwired Photoelectric Smoke Alarm with Battery Backup (MP117) Video

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MP117 customer reviews

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6 customers recommend this product
USI Electric Hardwired Photoelectric Smoke Alarm with Battery Backup (MP117) Reviews
Kenneth Rulli
January 30, 2019
Verified Purchase

Working fine. Easy to replace the old one.

Judy Giffin
February 6, 2018
Verified Purchase

We purchased our home about five years ago, it was built in 2007. We have some very high ceilings and the house came with eight ASI Electric Hardwired Photoelectric Smoke & Fire Alarms w/Battery Backup. We were replacing batteries but were still having problems with beeping and the alarm going off.. We decided to replace some units and were unsure of replacement units that we could find locally. We went online to Universal Security Instruments Store and found exactly what we needed at about half the price found locally. We easily ordered online, received free shipping and delivery within a week.

Michael DeCicco
November 6, 2017
Verified Purchase
MP117 Review

Easy to install and working well. Met my needs as anticipated.

Dexter Hernandez
November 4, 2016
Verified Purchase

Easy to install. Relief to know my family is protected.

Howard Webb
June 17, 2016
Verified Purchase
Good

Smoke alarm worked great. Installed easy and quick.

Patrick Patchen
May 4, 2016
Verified Purchase
easy install

Bought this smoke alarm to replace an older model. It took less than 5 minutes to change out. Happy with unit and ease of installation.

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