Poly Savi 8240 Convertible Office Headset tunes out noise & nearby conversations with a noise-canceling microphone & close-conversation limiting. Being able to talk for a long time on a single charge means work gets done. With the freedom to roam up to 590', you can keep calls going even away from your desk. Connect using Bluetooth for a wireless experience. Headset features three-way connectivity to your computer, desk phone & mobile phone. Make training & collaboration easy with ability to conference up to four headsets onto a single base. Charge lasts up to 7 hours of talk time & up to 30 hours of standby time. It only takes up to 3 hours to charge. DECT security-certified headset ensures your conversation remains private. Button controls include call answer / end, mute, volume, power on / off & ANC on / off for optimal convenience.