How to Connect Bluetooth ? 1. Press "MODE" 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. How to use Radio ? 1. Hang up the Radio Antenna. 2. Press "MODE" button to switch it to the radio state. 3. Press the "Play" button to search the entire channel and save. 4. Press the previous / next track to switch to use. Description: Type: Bluetooth Amplifier Board Model: -D9088 Bluetooth Version: 5.0 Audio Channel: 1.0 Rated impedance: 4 Rated Power: 40W Power Range: 30-120W (Deponds on Voltage) Distortion: 0.03% S Rate: 92db Battery of Remote: CR2025 x1(Included!) Voltage: AC 220V, DC 12V Plug Type: EU Plug, it applies to Indonesia, Germany, France, , Italy and so on. TIPS: This is not professional radio, no good effect, pls understand! TIPS: 1. Support AC 220V, automatic adaptation. 2. If connect to DC 12V-24V, the Current needs more than 3A. Warning: Pls select only one connection !!! To match the AMP and Speaker: 1. The impedance of the amplifier is the same as the speaker, can not be too far apart. 2. The power of the amplifier is 1.5 times than speaker to obtain a enough sense of strength. Material: Metal colour: black Package Contents: 1 amplifier board 2 x speaker cable 1 x 12V power cord 1 x remote control 1 x EU plug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.