Polaroid Bluetooth Wireless Mini Speaker Rechargeable & Portable System (Black) Superior audio - Small speaker delivers rich, powerful sound. Bluetooth - Connect any Bluetooth enabled device to wirelessly control music. Rechargeable - Long-lasting lithium-ion battery provides hours of play. Portable - Compact and stylish design lets you place this speaker anywhere. Aux in - 2-in-1 USB cable charges and connects for wired use.