Take your audio experience for conference calls to the next level. With the Poly Sync 20, you choose high-quality audio and microphones. The microphones have a shared range of 2 meters, and you can connect the Poly Sync 20 wirelessly via Bluetooth 5.1. Thanks to the built-in battery, you can make calls for up to 20 hours without recharging. Is your smartphone's battery almost dead? Connect it to the Sync 20 to charge it directly via a USB cable.