Product model: D900 2.1 Channel BT Amplifier Board with a suitable power supply of DC12~24V/5A or above BT version 5.0 with unobstructed range of 10 meters Compatible with speakers of 20~100W, 4~8 ohms Protection mechanism includes overvoltage, undervoltage, overheating, AC/DC detection, and short circuit protection Suitable power supply: DC12~24V/5A or above; (The higher the voltage, the greater the output power) Number of channels: 2.1 channels Input method: BT+AUX+MIC FM+USB+TF card Amplifier chip: Original imported chip Output power: Left and right channels<50W; subwoofer<100W Input sensitivity: 500mV Heat sink size: 50 * 25 * 10 (mm) Product size: 260 * 85 * 75 (mm) Noted Only when there is sufficient audio input and sufficient power supply voltage/current, can there be sufficient output power! 2. The higher the power supply voltage, the greater the output power, and the smaller the speaker impedance, the greater the output power 3. Please ensure that the power of the adapted power supply is greater than the actual working power of the amplifier! Plug Type: EU Plug, it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC220V Color: As Shown Material: ABS Package Contents: 1*Bluetooth Amplifier Board 1*Remote Control 1*DC Cable 1*Power Cable 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.