Powder coated metal housing with rechargeable lithium ion battery for up to 4 hours of play time. Bluetooth 3.0 connectivity with up to 30 feet of audio range offers great wireless sound and easy connectivity or connect via mini USB. Also accepts Micro SD card as well. Play from PC, iPod, iPhone, tablet or any MP3 device. Also features built in microphone for hands free calling on the go. Great giveaway for any occasion indoors or outdoors.