Features: brand new and high quality Our digital power amplifier board with for high fidelity and two-channel stereo sound quality, 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: 10W~200W, 4/8Ω. Adapted power adapter (recommend): 12V-24 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 + Aluminum Color: As Pictures Weight:335g Type:TPA3116 Dual Channel AUX USB Bluetooth5.0 Input voltage: 5~27V Bluetooth-compatible version: 5.0 Adapted speaker (recommend): 10W~200W, 4/8Ω Number of channels: 2.0 for CH Bluetooth-compatible transmission distance: 15 meters (unobstructed) Size : Approx.103x88x30mm/ 4.05 x 3.46 x 1.18 inches Package Includes: 1 Piece Bluetooth-compatible Amplifier Board 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. 5.The output power of the power supply must be greater than the output power of the amplifier,otherwise it will affect the sound quality.