JBL engineers believe that you should never ever need to compromise efficiency for mobility. Presenting the JBL Micro Wireless ultra-portable speaker. With its compact size, this speaker lets you take excellent JBL bass anyplace. It's the very first ultra-portable speaker featuring a Li-ion (lithium-ion) rechargeable battery good for 5 hours of efficiency, a built-in bass port for effective low-frequency playback and cordless Bluetooth connection. With a 1-5/8-inch (40-millimeter) motorist, it delivers full-range JBL sound with excellent bass - yet it clips onto clothing or fits easily in a backpack. You can wirelessly stream audio to the speaker from any Bluetooth-equipped mobile phone or tablet, or make use of the included 11-13/16-inch (30-centimeter) audio cable television - with a 1/8-inch (3.5-millimeter) stereo mini jack - to connect the speaker to any mobile phone or MP3 player. You can even daisy-chain the speaker with other JBL Micro Wireless speakers for an effective sonic experience. An ideal cordless audio solution for indoor or outdoor playback, the JBL Micro Wireless provides efficiency, mobility and rates that the competition cannot touch.