Customer Reviews For The Hardwired Photoelectric Smoke Alarm with 10 Year Battery Backup
Overall Rating
Product Reviews
This is a gift not given yet.
While these alarms are pricier than some of the others I elected to purchase them because the lithium battery would mean no changing of batteries, and its not easy to get to some of my detectors and I can get unbalanced fast on a ladder! The Customer Service email contact was EXTREMELY helpful with both tech information and the right alarm to get for the hardwire I already have. I shared with others in my neighborhood this information on our blog!
This smoke alarm was easy to install, uses the same kind of connector as Kidde alarm it was replacing. No false alarms so far.
So far, great! Very easy to install.
Arrived promptly and was easy to install. Should do me for 10 years but it was nice that you did what you said you would do.
Easy to install and just the combo function that I needed.
The USI products are excellent. Easy to install, great service, excellent products
Received quickly,as described. Need to find an electrician to install. Thanks for good service
Had to replace older model with new ones hope they last longer
Exactly what i needed. Slim design, great technology, and ease of installation. However, the plastic battery protector pull tab on 1 out of the 5 tore off incorrectly. It's unretreivably stuck inside which caused it to not activate. In process of getting a replacement.
Easy to install and I like the sealed 10 yr battery. fairly priced and quickly delivered.
Hi, had to replace my detectors since they were starting to go off when I cooked. They were 10 years old. I ordered 2 iono detectors 3 photo detectors and 1 carbon monoxide one all 10 year sealed and wired ones. They all installed and worked good and solved my cooking problem. Also the customer service was very responsive and the items were shipped quickly A+. Kevin
Product FAQs
Yes, if you the alarm has a battery backup. Hardwired smoke alarms are wired directly into your home’s electrical system, but nearly all modern models - including most Universal Security Instruments alarms - also include a backup battery. This built-in battery allows the alarm to continue operating even if your home loses power, ensuring you’re protected at all times.
Power can go out during a fire for several reasons. Intense heat can damage electrical wiring, circuit breakers may trip to prevent further hazards, or flames and smoke may affect electrical panels and utility lines. In some cases, firefighters or utility crews will intentionally shut off power to keep conditions safer. Because of these possibilities, the backup battery is an essential feature - it ensures your smoke alarm will sound even if the fire itself disables your home’s electricity.
For homeowners, this means peace of mind: whether it’s a fire, a storm, or a routine power outage, your hardwired smoke alarm is designed to keep working when you need it most.
Many people assume that every smoke alarm requires a backup battery change, but most Universal Security Instruments hardwired smoke alarms are designed differently. The majority of our models feature a sealed, 10-year lithium free battery that never needs to be replaced. This long-life backup battery is permanently built into the unit, ensuring continuous protection even during a power outage.
Because the battery is sealed, there's no door or compartment for you to open. When the alarm reaches the end of its 10-year service life, the entire smoke alarm should be replaced with a new unit. This design eliminates the need for battery changes, prevents tampering, and ensures you always have reliable backup power.
If you have an older model that uses a replaceable battery, the user manual will provide step-by-step instructions. Typically, this involves twisting the alarm off its mounting bracket, opening the battery compartment, and installing a new battery of the specified type. However, if your alarm is a newer sealed-battery model, you do not need to replace the backup battery at all.
You can replace a single alarm, but for best protection and compatibility it’s recommended that all interconnected alarms in your home are from the same manufacturer and of a similar age.
MP116S Video Guide
Watch this helpful video to learn more about the USI Hardwired Photoelectric Smoke Detector with 10 Year Battery Backup - MP116S.
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