Elecom 11314. Wireless range: 10 m, Bluetooth version: 2.1+EDR, Bluetooth profiles: A2DP, AVRCP, HFP, HSP. Ear coupling: circumaural, Headphone frequency: 20 - 30 Hz, Headphone sensitivity: 111 dB. Battery technology: Lithium-Ion (Li-Ion), Battery capacity: 150 mAh, Talk time: 11 h. Input voltage: 5 V, Input current: 0.150 A