Lepa BTS02-BK 4.0 Bluetooth Speaker with NFC Function (Black) 360 sound emits to every corner with Built-in passive radiator for superior bass. Bluetooth 4.0 wireless technology with simple tap to link with NFC. Built-in microphone and built-in rechargeable battery Operates additionally as a 2200mAh backup power bank for smartphone devices, perfect for outdoor activity (IP54). Aux-in for other audio devices, micro-USB, audio cable and carry pouch included.