Wireless key finder

Working frequency: 433.92MHz
Working distance: about 30-40 meters
Volume: 75-80 dB
Transmitter battery: AAAX2pcs
Receiver battery: CR2032
Launch size: 105 * 46 * 13mm
Receiving size: 50 * 31 * 11mm
Transmitter base 76 * 30mm
Packing size: 10.6 * 18.4 * 3.3cm