Bluetooth profile: V2.1+EDR. Bluetooth protocol:HFPV1.5, A2DPV1.2, AVRCPV1.0. RF distance:10M. Frequency:100 Hz-18 KHz. SNR:85 db. Distortion:0.5% Working voltage/current:3-?4.2 Volt. Charging voltage/current:DC 5 Volt. Battery capacity:350 mAh. Playback time:About 3 Hours. Rated power:3 Watt Product size:60x50Mm Hands free call:Yes TF Card:Yes Material:Aluminum + ABS. Complies with CE, FCC, RoHS.