Review on Efficient Key Finder: EIRIX Wireless RF Locator with Remote Control - Ideal for Dogs, Kids, Cats, Luggage, Wallet, Car Keys - Includes 1 RF Transmitter and 5 Fluorescent Receivers (Black-5 Receivers) by Jasneet Jazzy

I bought this because my partner and I have a bad habit of losing our wallets and keys which makes us late for work, events etc. come have used the key search several times. The beep is loud, loud enough that someone (me) with a hearing impairment can easily hear it. It's easy to determine which room the lost items are in. Battery life in both the trackers and remote is good - we haven't had to charge the trackers or change batteries in the remotes yet. It doesn't take long to charge the trackers the first time you use them, an hour at most. Color coded trackers are good too. Basically we are very satisfied. Now we can find our keys and wallets much faster thanks to this key tracking kit.