Elecom Bluetooth Stereo Headset. Wireless range: 10 m, Bluetooth version: 2.1+EDR, Bluetooth profiles: A2DP, AVRCP, HFP, HSP. Ear coupling: intraaural, Acoustic system: closed. Battery technology: Lithium-Ion (Li-Ion), Talk time: 4.5 h, Standby time: 90 h. Weight: 13 g. Compatibility: Telephone, Input voltage: 5 V, Input current: 0.15 A