Features: High-power signal works through walls and floorsBeep sounds and flashes enable you to find lost items easierNo longer rummaged to find something and come with a base support for your tidy roomBig buttons and easy operation・ suitable for most people 3 receivers correspond with different colorsThe receivers are attached with key ring Great anti-lost helper for your familySpecifications: Remote Battery: CR2032Receiver Battery: CR2032Transmitter Size: 4.5 x 9.75cmReceiver Size: 4.28 x 3.1 x 1.33cmWorking Range: 20 - 30m ( outdoor)・ 15-20m (Indoor)Sound: 70 - 80dBFrequency: 433.92MHzPackage Contents: 1 x Transmitter・ 3 x Receiver・ 3 x Key Ring・1 x English User Manual