POLY Sync 60 Speakerphone. Device type: Mobile phone/PC, Product color: Black, Silver, Maximum operating distance: 1181.1" (30 m). Driver type: Dynamic. Microphone frequency: 100 - 6700 Hz, Microphone direction type: Bidirectional microphone, Microphone sensitivity: -45 dB. Connectivity technology: Wired & Wireless, Interface: USB/Bluetooth, Bluetooth profiles: A2DP, AVRCP, HFP, HSP. Power source type: Battery, Battery technology: Lithium-Ion (Li-Ion)