Connects to your desk phone, PC/Mac and mobile. Noise canceling omni-directional microphone wipes out disruptive background noise. Wireless freedom up to 250 ft. Bluetooth 5.0 with BLE. Bluetooth profiles : A2DP, HFP, HSP, PBAP, SSP2. Talk time up to 7 hrs. Six layers of WindSmart technology, PC wideband and mobile wideband: up to 6,800 Hz; echo cancellation, proprietary DSP, A2DP. Codecs : MSBC, G.722, CVSD, SBC. 13.6 mm speaker. Speaker range of 100 Hz-20 kHz. Speaker impedance 16 ohm. Battery capacity of 122 mAh typical / 120 mAh minimum. Rechargeable non-replaceable lithium-ion battery. 1.5 hours charging time. Soundguard : protection against sounds above 118 dBA. Call answer/ignore/end, redial, mute, volume + /- and track forward/track back/pause/play. NFC pairing. Built for UC applications and softphones from Avaya, Cisco, Microsoft, etc. 0.04 lbs. Sold by each.