Fully Qualified Bluetooth v2.1+EDR Chip set Speaker Output : 1W Maximum Audio : 126dB Receiver Sensitivity : -82 dBm (typ.) PTT function built-in Talking Range: Bluetooth class 2, 10 meters Display LED: Blue and Red Support : HFP Profile. DC Input : 5 Vdc (std.) DC Current : 13.35 mA (Average) DC Current : 20 mA (MAX volume) Battery : 240mAh Continue Talking Time : more than 5 Hours