This Acoustic BeatsBar Bluetooth Portable Speaker with Charge-Out Feature applies the Bluetooth 2.1 wireless technology platform that enables you to enjoy music, video and cell phone hands-free calling everywhere you want. This speaker comes with a 1,500mAh lithium ion built-in battery, which supports up to 18 hours music streaming. The charging out function enables you to charge your portable devices (i.e. mobile phones/iPods) anywhere. The LED battery check shows the battery status in a glance.