Mini and portable Bluetooth speaker&FM radio. Designed and crafted with the consideration of convenience and aesthetics. Compatible with all Bluetooth-enabled devices. Instantly connects to your smartphone, tablet, or computer from up to 33 ft/10m away. MUZEN OTR Metal automatically reconnects to the last device used. Built-in Lithium-Ion rechargeable battery guarantees up to 10 hours playtime*. Recharge fully in just 2-3 hours with the included micro USB cable. Winner of the CES Innovation Awards, MUZEN OTR Metal is extremely loud with crisp sound and strong deep bass, powered by 5W full-bodied stereo realized through a high-performance driver and a unique enhanced bass. MUZEN OTR Metal portable Bluetooth speaker&FM radio is crafted with a high-density alloy, has a compact size of 3.46 x 2.56 x 2.2 inches.