SoundBlade Portable Stereo Bluetooth speaker with Voice Confirmation. 2 x 1.5: Full Range Neodymium Drivers. Dual passive radiators for enhanced rich bass. On board microphone for clear, hands-free communications. Altec DSP Audio Enhancement technology for optimum music playback. 3.5mm Aux in connector for added device compatibility. Built-in rechargeable Li-ion battery (8 hours battery life).