The ifidelity Sound Design Pro Bluetooth Speaker delivers premium stereo sound with a booming bass. With 2x10 Watt Speaker drivers and a built in DSP (Digital Signal Processors) Technology the Sound Design Bluetooth Speaker delivers sound with tight mid frequency and crystal clear high frequency. In addition to the 20 Watt Speaker Drivers, the Sound Design Bluetooth Speaker is packed with two passive radiators and a 12Watt subwoofer for strong bass and no distortion. With a built in rechargeable 2200mAh battery the Sound Design can operate on max volume for over 8 hours. Audio can be steamed by Bluetooth, 3.5mm Input, or a Micro SD Card. An ETL Certified 12.5V/2.5A Power Adapter, a 12” 3.5mm Aux Cable, and Instruction manual are included. Bluetooth working range is 33ft. Charge Time: 2hrs. Bluetooth Version 4.1.