EPOS EXPAND 40T. Device type: Universal, Product colour: Black, Grey, Maximum operating distance: 25 m. Sensitivity: -89 dB, Magnet type: Neodymium, Frequency range: 100 - 20000 Hz. Microphone frequency: 150 - 7500 Hz. Connectivity technology: Wired & Wireless, Interface: USB/Bluetooth, Bluetooth profiles: A2DP, AVRCP, DI, HFP, HSP. Power source type: Battery, USB, Battery technology: Lithium Polymer (LiPo), Battery capacity: 1110 mAh