About this item Wide Compatible: Universal compatibility with Android and iPhone tablets, smartphones, iPods, MP3, MP4, and other Bluetooth enabled digital speaker players. Built-in Battery: The speaker comes with a built-in rechargeable battery; charge the battery fully before using it the first time; only use the supplied USB cable to charge the speaker. Built-in Microphone: It has a built-in MIC Bluetooth speaker and hands-free function, allowing you to conveniently pick up a call with this mini speaker in your car, bathroom, home, office, or anywhere when it is connected to your smartphone. Impressive, User Friendly Design: Detachable suction cup and aluminum alloy metal hook offer you the convenience to hang and attach it anywhere you want; it can be used under harsh environments, as it's dustproof and waterproof. Portable Speakers: Wireless portable Bluetooth speakers let you enjoy high-definition stereo sound with impressive volume, whether you're lounging around the house, part