Works with Bluetooth headphones, speakers and the included super lightweight earbuds. Super lightweight; can be clipped to clothing or gear. Durable and water resistant with IPX5 certification. Built-in FM radio. Plays up to 20 hours on a single charge (wired connection). USB 2.0 micro-B port for high-speed transfer and charging. System Requirements:. Operating System: Windows 10/8/7/Vista, MacOS X Ver. 10.3 or higher.