The Tenergy Mini Bluetooth Speaker is compatible with all wireless Bluetooth devices including the iPhone, iPod, BlackBerry, smartphones, tablets, notebooks and desktops. It's perfect for listening to your favorite music when you're traveling or out with friends and family. Simply connect the speaker to your Bluetooth device or to any other audio device via 3.5mm aux line-in cable connection and enjoy the loud, clear, and high fidelity music. The speaker also features a Micro-SD card slot, which allows you to play music from an additional source (MP3 and WAV music file formats are supported). With a high capacity built-in rechargeable battery, the Tenergy Mini Bluetooth Speaker can playback music non-stop for 6~8 hours (with 80% volume) per charge.