Frequency: 2.40 GHz-2.48 GHz Power: ? 4 dBm, Class 2 Effective range: 10M Sensitivity: 105db / 0.1% Ber Frequency response: 20Hz-20kHz S / n rate: 110 dB Distortion :0.10% Speaker size: 40mm Support A2DP 1.2, AVRCP 1.0, HSP, HSF 1.5 Voltage: 3.7vdc (350mAh rechargeable battery) Talking time: 8 hour Music time:6 hour Standby time: 148 hours Charging time: 1.2 hours Current: 20 mA Operate temperature: -4 ~ + 131 ° F (-20 ~ + 55 ° C)