Material: ABS Size: Transmitter: 105*45*13mm; Receiver: 49*35*10mm Color: Transmitter: Black; Receiver: Green, Purple, Blue, Red; Base: Black Quantity: One set Package content: 1 x transmitter (with 4 x battery), 4 x receiver, 1 x base, 4 x 3M glue, 4 x hook 1. Hand-held transmitter: Features 4 color buttons and LED indicators, easy to carry and use for locating misplaced items. 2. Portable transmitter: Equipped with 4 large buttons, designed for convenient use anytime, anywhere. Helps locate keys, wallets, or other valuables quickly. 3. Ergonomic receivers: Set includes 4 receivers with keychains to securely attach to wallets, keys, or other items. Loud beep alert allows for easy detection at a distance. Signal can penetrate walls, floors, pillows, and leather. 4. Usage steps: Attach the color-coded receiver to frequently misplaced items using the key ring. Press and release the corresponding button on the transmitter. If within range (up to 30 meters), the receiver will beep and the LED will flash. If no sound is heard, try changing location or replacing the battery, then press the button again. 5. Ideal gift: Includes one transmitter, 4 color-coded receivers, and a base. A practical gift for family and friends.