Bluetooth stereo speaker rapidly pairs with any Bluetooth device for a clear, vibrant sound and is Bluetooth 3.0plusEDR, A2DP compliant. The compact speaker system, with its universal audio input, can be used with any tablet, MP3, smartphone, laptop and more. One-watt speaker offers a pre-amplified, magnetically shielded frequency response of 180 Hz - 19 KHz. Design also features full-range NDFEB drivers, 3.5 mm stereo input for connection without Bluetooth, function key (power SW), and pairing LED indicators (charging indicator, BT status indicator). Power sources include DC in (Micro USB 5V 500 MAH) and built-in Li-Battery 3.7V 600 MAH.