Material: Import PC + ABS plastic alloy structure Rugged,Shockproof Dustproof Size: 47*40*11mm Bluetooth Version: Bluetooth V3.0+EDR Bluetooth Protocol: A2DP + HFP 1.5 + HS P 1.2 Range of Frequency: 2.4GHz spectrum Ambient Noise: ?75dB Transmitting Range: ?10m Charging Time: about 1 hour...