Specifications : Demensions:76*29*9.6mm Wireless: BLE 5.1 Range:0-50M; Buzzer: 90DB Battery: CR2032*2 Voltage: 3V Operating temperature: 0-50℃; FCC Caution: This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.