Power Source: Built in Rechargeable Lithium Battery
Bluetooth Headset Spec: - Bluetooth Version: 1.2 - Frequency Range: 2.402 to 2.480 GHz Spectrum - Profiles: Headset, Handsfree, A2DP - Class: Class II - Operation Range: 10 Meters - Talk Time: 6 hours(dependent on power consumption of paired device) - Music Play Time: 6 hours (dependent on power consumption of paired device) - Standby Time: up to 150 hours - Compatibility/Pairing: All Bluetooth devices V1.2 and under - Power Source: Rechargeable Internal Li-Ion Battery