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*transmitter (with 4*battery), 4*receiver, 1*base, 4*3M glue, 4*hook 1.Hand-held transmitter: with 4 color buttons and LED indicators, it is easy to carry and use, search for inappropriate objects anytime, anywhere. 2.Portable transmitter: With 4 large buttons, it is easy to carry and use anytime, anywhere. This will help you and your loved ones find misplaced keys, wallets or other valuables within seconds. 3.Ergonomic receivers: There are 4 receivers in total, which are equipped with keychains, which can safely store your wallet, keys or other valuables. It is simply a child's game! Easy to hear: Accompanied by a loud beep, your wireless wallet and key position will be effective at a long distance. It can also penetrate walls, floors, pillows and leather effectively. 4.Use steps: First use the key ring to fix the color-coded receiver on the items you often lose. Second, press and release the corresponding color-coded button on the transmitter. If the receiver is within range (30 meters), it will beep and the LED indicator will flash. If you do not hear the beep, please change your location or use a new battery and press the button again. 5.Ideal gift: This product has a transmitter, 4 color receivers and a base. It is an ideal gift for family and friends.