With the Savi 8240 Mono-ear Wireless Bluetooth Headset & its noise-canceling technology, you can tune out noise & stay focused whether you're on your computer, desk or mobile phone. This three-way connectivity allows convenient conferencing on up to two devices at once. Transfer audio between headset & mobile phone with the press of a button. Having the freedom to roam & talking a long time on a single charge (or for an unlimited time with a hot swappable battery) means work gets done even away from the desk. Talk time is up to 7 hours. Headset charge lasts up to 30 hours in standby mode. Charge time is 3 hours. Call controls include call answer / end, mute, volume & on / off.