Bluetooth amp charging bluetooth 41 supports a2dp avrcp hfp hsp 10m wireless range bluetooth frequency range 24 ghz 24835 ghz up to 10 hours playback 13 hours talk time 250 hours standby time charge time approx 5 hours charging input usb dc 5v battery rechargeable 380mah li polymer battery the sandberg blue storm wireless headset connects wirelessly to a bluetooth device such as a mobile phone or tablet computer remote control your bluetooth device with the track and volume controls o