Press and Beep to Save AppJust press the coded button of the remote tracker, and the corresponding receiver will beep and flash immediately, helping you find the connected item easily. While phones with the car key finder app can sometimes die, the locator tag's coin battery lasts 6-10 months with daily use. Classic Version with FlashlightThis noisy key finder is a proven model from the past decade and comes with 4 oval smart finder tags, which are slim and lightweight, measuring 1.9" x 1.2" x 0.3 inches and 0.17 oz (5 g). A built-in LED light acts as a useful backup flashlight for rainy days. Loud Buzzer, 131ft Long RangeThe buzzer volume is up to 85dB, even people with poor hearing can find lost items easily. The stick's radio frequency waves on the remote finder can penetrate walls, floors, cushions, and more, helping you track items up to 131 feet away (tested in an open area). The distance works well to cover the entire area of your apartment and is great as a lost key finder or tracker for wallets, cell phones, glasses and hidden pets. Indoor and Outdoor UseThe item finder is portable in size and light in weight, suitable for indoor and outdoor use, such as when you want to retrieve a pet from the yard or find luggage while traveling. Comes with 4 stickers and 4 keyrings, you can stick the keychain to TV remotes, glasses and earphone cases, or attach it to keychains, backpacks, pets, children, walking sticks and more. For mobile phones, a protective case and lanyard are also required. For the wallet, just put the key fob in. Convenient and ThoughtfulSet the find my key device on the top of the table or other places you can easily remember. The receiver button battery is easily installed and replaced with just a coin. Transmitter requires 2 AAA batteries (not included).