Specifications: Dimension:18*14*5cm Output Power: 45W + 45 W Speaker Impedance: 4-16 Input Voltage: AC 110V~220VDC -12V (DC -12V Adapter not included) Bluetooth transmission distance:10m (About 32 feet) Input Mode: Supporting AUX/ USB/TF Card/ FM Radio/ Bluetooth How to power on the amplifierstep 1: Plug the adapter to the wall first Step 2: Power on the amplifier, ready for use Having trouble connecting to bluetooth?1. Connect speakers wires.2. Power on unit.3. Select mode button on unit to change from line to bluetooth.. 4. Go to settings in tablet, phone etc. & then wireless & connect to G30 amplifier device.5. Play music on connected phone, tablet etc, adjust the background music, speakers volume. Note:1. The amplifier can be searched & connected via Bluetooth when unplugging audio input line.2. Insert audio input line, then press the mode button on unit to switch to AUX mode.3. Pleaseunplug the bottom of insulation before using the remote controller.4. It is recommended to use remote on the bluetooth mode.5. Plsface the led screen of amplifier when using remote controller. Package included:1 XBluetooth amplifier