The JBL Micro Wireless is the first ultra-portable speaker featuring a Li-ion (lithium ion) rechargeable battery, a built-in bass port and a wireless Bluetooth connection. With a 1-5/8-inch (40mm) driver and an acoustic volume of 100cc, it delivers legendary JBL sound with exceptional bass -all in a speaker that fits easily in backpacks or clips onto clothing. You can wirelessly stream audio to the speaker from any Bluetooth-equipped device, or use the included audio cable to connect it to any mobile device or MP3 player. You can even daisy-chain it with other JBL Micro Wireless speakers for a powerful sonic experience.