Details LED USB 2.1 Wired Combination Speaker Bass Music Subwoofer for Desktop Laptop Notebook Tablet PC Smart Phone Home Theater Note 1. Speaker is USB powered; no batteryinside the speakers; so it send withUSB power cable which is connected with speaker. 2. Speaker has 2 modes; Bluetooth onewith Bluetooth and AUX; AUX modeonly has AUX; no Bluetooth. 3. When connected to computer; it is AUXmode; if you want to switch to Bluetoothmode; press the button once; and it willbe Bluetooth mode; then co