... + Earpiece + FM • Features:1, Bluetooth 2.0+EDR compatible with all bluetooth enabled mobile phones ... .2, Noise suppression and echo cancellation ... 0 and A2DP 2, Working voltage: 12 to 24V DC 3, Frequency: 2.4GHz 4, Battery capacity ... : 1,700mAh 5, Standby time: 120 hours 6, Earphone battery capacity: 60mAh 7, Earphone working time: 2 ...