Panasonic RZ-B100. Product type: Headset, Wearing style: In-ear, Recommended usage: Calls & Music. Connectivity technology: Wireless, Bluetooth profiles: A2DP,AAC,AVRCP,HFP,SBC, Wireless range: 10 m. Ear coupling: Intraaural, Intraaural headphones type: In-ear monitors, Acoustic system: Semi-closed. Microphone type: Built-in. Battery type: Built-in battery, Battery technology: Lithium Polymer (LiPo), Battery capacity: 40 mAh