I purchased and installed four of these units. If the batteries really last ten years, I will be back to upgrade to 5 stars. This is a very good option for difficult to reach installations. I like the idea of never having to change the battery, just the alarm itself every ten years (all smoke alarms should be replaced within ten years). A few caveats: this alarm does not install easily over a standard round electrical box (the type used for wired detectors). The mounting base is big enough to disguise the box if you want, but note you will have to locate and drill some holes to mount the base (which is what I did). Once activated, the alarm can only be silenced with a button-- you cannot remove the battery. The battery can be permanently discharged by the user, which you do when the alarm reaches end of life and starts "chirping". Overall I'm pleased with the product, and will be very pleased indeed if the batteries last as long as advertised.
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