The Plantronics Voyager 855 is a Bluetooth headset is designed to be used with phones that have MP3 capabilities. The headset's earbuds are designed to block out surrounding noise and it's AudioIQ technology enhances the call quality. The Voyager 855 features a sliding boom that brings the microphone close to the mouth and is also used to answer and end calls. It also has a detachable cable that converts the headset from monoaural to stereo and Multipoint technology which allows the user to connect to two devices simultaneously. The battery life of the rechargeable lithium-ion battery is up to 7 hours talk time and 160 hours standby.