Size:Savi W8220M Features: Wireless multi-device connectivity - Seamless management of PC, mobile & desk phone calls. transfer audio between headset & mobile phone with the press of a button. Noise-canceling microphone with Close Conversation Limiting - Blocks background noise and nearby conversations. One- touch controls - Call answer/end, volume up/down and mute (on/off). Up to 13 hours of talk time - Adaptive power system allows you to automatically downshift to low power when the headset is close to the base to save battery life. Flexible microphone boom - Position the boom so it is the ideal distance from your mouth (two fingers distance) to optimize voice quality. Ringer in the base - Ringer conveniently located in the base with volume controls (off, low, medium, high). Standby time - Up to 50 hours standby time Headset wireless range - Line of sight: 580 ft/180 m; Typical office environment: 180 ft/55 m Battery capacity - 490mAh Battery type - Rechargeable, replaceable, lithium ion polymer Charge time - 3 hours Wireless technology - DECT 6.0 and Bluetooth v4.2 Audio profiles - Advanced Audio Distribution Profile (A2DP); AVRCP; Bluetooth Hands-Free Profile (HFP); Bluetooth Headset Profile (HSP) Codecs - G726, G722, Broadvoice32, OPUS/CELT 16kS, OPUS/CELT 48kS Receive audio performance - Active noise canceling (ANC) Receive frequency response - Wideband: 1006800 Hz; Multimedia 20 Hz20 kHz Hearing protection - SoundGuard DIGITAL, G616 anti-startle (during calls); Time-weighted average prevents average daily noise exposure from exceeding 85dBA Microphone technology - Noise canceling Microphone frequency response - Wideband: 100 Hz6800 Hz Microphone sensitivity - 112 db SPL max Headset weight - 0.25 lbs/115 g Call controls - Call answer/end, mute, volume +/-, ANC on/off, power on/off Languages - Configurable by Plantronics Hub software