Features: brand new and high quality Our Bluetooth-compatible board for amplifier audio comes with AUK and Bluetooth-compatible two audio input methods, which means the transmission efficiency is high and the transmission for path is wide. The Bluetooth-compatible 5.0 audio/speaker board for amplifier uses a high-performance audio filter that can output high-quality sound. Adapted speakers: 30W~200W, 4/8Ω. Adapted power adapter (recommend): 12V-24V Adopting copper for DC connector and fence type terminal, this Bluetooth-compatible board module for amplifier can withstand large currents, no heat, no damage to the wire. The for DC for head lead, for the input power interface of this product, even if you don'for t have a for DC for head adapter or battery, it can be easily wired. Support 3.5mm wired input and Bluetooth-compatible 5.0 input, easy installation, mini size, perfect for Bluetooth-compatible speaker. Specifications: Material: ABS Color: As Pictures Weight:65g Type:C50L Input voltage: 5~26V Bluetooth-compatible version: 5.0 Adapted speaker (recommend): 30W~200W, 4/8Ω Adapted power adapter: 12V-24V for DC, current above 6A Number of channels: left and right stereo dual channels Bluetooth-compatible transmission distance: 15 meters (unobstructed) Size : Approx.50x56x18mm/ 1.96 x 2.2 x 0.7 inches Package Includes: 1 Piece Bluetooth-compatible Amplifier Board 1 for DC Adapter note: 1.Keep away from the router when use it. 2.Avoid using it on the metal table, whicn will effect the antenna signal. 3.If you refit the speaker, if it is a matal for shell, you must lead the antenna out of the for shell. The metal for shell will shield the signal. 4.Only when the audio input is sufficient and the power supply voltage/current is sufficient, there will be sufficient output power. Different voltage & Output 4Ω Speaker Impedance 12V: 40W + 40W 15V: 60W + 60W 19V: 90W + 90W 24V: 110W + 110W 8Ω Speaker Impedance 12V: 24W + 24W 15V: 36W + 36W 19V: 64W + 64W 24V: 76W + 76W