Retro classic cool with updated tech. Mini & portable Bluetooth speaker & FM radio. Compatible with all Bluetooth-enabled devices. Instantly connect to your smartphone, tablet, or computer from up to 33 ft/10m away. MUZEN OTR Metal automatically reconnects to the last device used. 81 10 hour playtime with built-in Lithium-Ion rechargeable battery. 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. Compact 3.46 x 2.56 x 2.2" so you can fit it easily in your bag or carry with you to enjoy your music wherever you are. Bluetooth verison 4.0. 12 month warranty.