EASY TO USE The JTDKF4F wireless key finder is simple to use by design! Simply press any button on the transmitter and the corresponding receiver will beep to help you find your missing item. Attach the receivers to keys, remotes, glasses or anything else you frequently lose track of. LONG DISTANCE TRACKING Track down missing items like house keys, car keys, wallets, glasses and even pets up to 131 feet away! The RF (radio frequency) signal from the transmitter can penetrate through walls and floors (and couch cushions) so that you can locate your missing items. 80dB LOUD BEEP The JTDKF4F key finder receivers beep very loudly, up to 80 dB, every time their corresponding remote button is pushed. Each time a button is pushed on the remote, the receiver will beep for 5 seconds making it easy to pinpoint exactly where your missing item is located. BUILT-IN REMOTE FLASHLIGHT Use the built-in remote flashlight to locate your devices in dark areas like under the couch or in a closet.