Portable Stereo Bluetooth speaker with Voice Confirmation. Built-in USB Charging port to charge your smart-phone and other device. Wireless Check In for effortless pairing with NFC equipped devices. Altec DSP Audio Enhancement technology for optimum music playback. On board microphone for clear hands-free communications. 3.5mm Aux in connector for added device compatibility. 2 x 2" full range drivers and dual passive radiators for enhanced rich bass. Built-in rechargeable Li-ion battery (7 hours battery life).