Travel-friendly size.TWS Stereo Sound. Can be paired with a second speaker to provide even more sound. Designed for more than just music, the Cube Bluetooth Speaker features a built-in microphone, for hands-free calling at the touch of a button. Equipped with a rechargeable battery, this compact speaker provides up to 5 hours of continuous playtime on a single charge, and a convenient on/off button allows you to conserve battery life when not in use. Sold by each.