iLive Sound Bite Bluetooth Wireless Speaker Built-in Bluetooth speaker Mini-USB port for battery recharge (cable included for recharging) DC battery power: built-in rechargeable lithium ion battery Battery life: approximately 2 hours on a single charge 3.5mm audio line input for connecting MP3 players (players sold separately) Bluetooth Speaker Mini Usb Port For Battery Recharge Built-In Rechargeable Battery