Item Name: Amplifier Board Material: Plastic Product Name: Mini Version with Filter 2x100W Bluetooth-compatible Digital Power Amplifier Board Product Model: ZK-1002L Whether There Is A Filter: Yes Compatible Power Supply Voltage: 5~24V (9V/12V/15V18V/24V And Other Adapters Are Optional, High Voltage Is Recommended for High Power Compatible Speakers: 50W-300W, 4-8 Number of Channels: Left And Right Channels (Stereo) Bluetooth-compatible Version:5.0 Bluetooth-compatible Transmission Distance: 15 Meters (Unobstructed) Protection Mechanism: Self-restoring Overheating Protection, Self-restoring Short Circuit Protection Power Supply Voltage: 12V-----8 Ohm Speaker/24W+ 24W, 4 Ohm Speaker/40W+ 40W 15V-----8 Euro/32W+32W.4Huan/Daqian 60W+60W 19V-----8 Ohm/64W+64W, 4 Ohm/Large 80W+80W 24V-----8 Ohms/72W+72W, 4 Ohms/Big Hand 100W + 100W Features: Compact Size, Easy Pairing, Bluetooth-compatible, 2x100W Output, Stereo Sound Quality, Switch Design, Volume Adjustment Size Details: L: 6.9cm, W: 5.3cm, H: 2.2cm(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. The output power will be sufficient only if the audio input is sufficient and the supply voltage/current is sufficient. Higher supply voltage will result in more power, and speakers with different impedance will have different output power. Please note that the higher the speaker's ohms, the lower the relative sound power will be when the voltage and current are sufficient! Package Includes: 1 x Bluetooth-compatible Amplifier Board