Woopker D10-II Bluetooth Audio Amplifier Board with LED Screen 30-120W for 4 Ohm Speaker Home Power Amplifier Module for Car RV How to use ?Different from 2.0 channel amplifier which use Left and Right same speakers, this 1.0 mono amplifier board, its 2 output interface frequency are different, the high-frequency interface is connected to the Treble Speaker, and the low-frequency interface is connected to the Bass Speaker, so as to achieve the stereo tone reverberation effect.TIPS: Don't connect ordinary 2.0 speakers, otherwise the side connected to the bass will feel weak, cuz ordinary speakers cannot achieve bass effect.Note:1. The AC Power will finally convert to DC 12V via the transformer built-in, you can connect DC 24V Power for higher power.2. Only use 1 power supply method. If connect DC Power, the current must over 3A.3. DIY product, the circuit board on the back will be hidden, pls focus your attention on its sound effect.4. The ''Power Switch'' button just for AC Power mode, Not valid in DC mode.5. The mic port not support guitar. for better effect, phantom power is recommended.Description:Type: Amplifier BoardModel: D10/D10-IIBluetooth Version: 5.0Audio Channel: 1.0Rated impedance: 4Rated Power: 40WPower Range: 30-120W (Deponds on Voltage)Fit for Speaker: 4 ohm / below 40WDistortion: 0.03%S/N Rate: 92dbBattery of Remote: CR2025 x1(Not Included)Input: Bluetooth/3.5mm RCA/U-Disk/TF/MICFeature: FM Radio / Treble / BassVoltage: AC 110V/220V, DC 12-24V''MODE'' Switch = Long Press ''Play'' ButtonHow to Connect Bluetooth ?1. Long Press ''Play'' button to switch it to Bluetooth status.2. Open phone Bluetooth, search the Bluetooth device and connect.3. You can use it after pairing successfully.About FM Function:1. Expand the Radio Antenna.2. Switch it to the FM Mode.3. Press ''Play'' button to search the entire channel and save.4. Press the previous / next track to switch to use.TIPS: This is not professional radio, only a small number of channels can be listened to. For more channels, pls buy professional radios.Package Included:1x Bluetooth AMP Board1x Remote Control2x Audio Cable1x AC Power Cable1x DC Power LineNote: Battery of Remote is Not Included Feature:Support reading MP3 songs in TF-card / U-disk.Independent adjustment of Treble, Bass and Master volume.Built-in Bluetooth Receiver and FM Radio Function.With AUX input Port, can be connected to the PC / Phone / CD.Dual microphone input, adjustable reverb.Support Voltage AC 110V/ 220V or DC 12V/ 24V.