Function: * Support A2DP mobile phone, transmitting stereo music directly * Pair with Bluetooth Mobile phone,enjoy wonderful stereo music and never miss any call * Wirelessly Chat online.(Skype/MSN/QQ) * Compatible with all functions of mono Bluetooth headset * Noise cancellation technology * With Mp3 earphone function * Using for a long time. Specification: * Bluetooth Version: 2.0 * Bluetooth Profile Version: Headset Profile, Handsfree * Transmitting Power: Class 2 * Frequency Range: 2.4020 GHz-2.4800GHz * Working Distance Range: up to 10 meters * Output Voltage: DC 5.0V 300mA * Charge Time: 2.5-3 hours * Talk Time: up to 9 hours * Listen Time: 8 hours * Standby Time: Up to 8 days * Headset Size:54(L) x47 (H) x 16(Thickness) mm * Weight (main unit):38.4g