... for waterproof ,dustproof, shock absorption Specifications 1, executive standard: Bluetooth V2.0 2 Working distance: 10 meters 3, modulation system: FHSS 2 ... .4G4, transmitting power: Class 2 5, operating voltage: 3.0-5.0 6, work current: <5.0MA 7, standby current: 2 ...