HIFI Stereo Bluetooth Headphones

Item Type: Headphones Bluetooth Version: V4.0 Frequency: 2.40GHz-2.48GHz Power: ≤ 4 dBm, Class 2 Effective Range: 10 M Sensitivity:  -84dBm / 0.1% BER Frequency Response: 20 Hz – 20 KHz S/N Rate: 70 dB Distortion: 0.10% Speaker Size:  40 mm Support: A2DP 1.2, AVRCP 1.0, HSP, HSF 1.5 Voltage: 3.7VDC (Built-in 400 mAh Rechargeable Battery) Talking Time: 8-9 Hours Standby Time: 250 Hours Charge Time: 2-2.5 Hours Current: 40 mA Operate Temperature: -20 ~ 55°C Package Includes: 1 x Headphones 1 x Charging Cable