4 Key Locators with Sound: Can't find your lost item? Choose Reyke Key Finder: simply press the button and follow the beep. You'll never lose your valuables again. Comes with 4 receivers, a keychain, and double-sided tape to attach to keys, TV remotes, mobile phones, wallets, pets (cat tracker), luggage, or any other valuables that are easily misplaced. 80 dB Beep and LED Flashlight: No phone or app required. Just press the corresponding color-coded button, and the receiver's beep will help you locate your lost car key. The integrated LED flashlight can be used to locate lost items in the dark. Battery Life: Tired of changing batteries frequently? Comes with high-quality batteries to extend the device's lifespan. Package List: 4 CR2032 batteries for the receiver and 2 AAA 1.5V batteries for the transmitter. Long Range Up to 40 Meters: Find your lost items no matter where they are with Reyke TV. RF can easily penetrate walls, carpets, and doors, tracking keys and wallets up to 40 meters. (Walls and other obstacles may reduce sound levels). A Great Gift: Designed with large buttons, easy to use, especially suitable for elderly parents and forgetful friends. Reyke Key Tracker/Find My Keys prevents you from losing items and is simple to use by attaching the receiver to your important items. Easy to Use: 4 different colored buttons. Attach items you need to find to the keychain. Press the corresponding color-coded button on the remote, and the alarm will sound, guiding you to your item. The sound is clear and audible within a 10-meter radius and can penetrate walls. No app download needed. Very simple operation for seniors and children. The button battery lasts six months, and the remote uses AA batteries. Visit the store for consultation. Installing Button Battery: If the back cover of the button cannot be opened, use a button stack inserted into the small gap on the cover and gently twist. Avoid excessive force to prevent scratching the cover; twist slowly. Note: All data is measured manually. Please allow for a 1-3cm error due to differences in light and display. Color variations may occur; refer to the actual item received.