Model Number: Vinyl Record Player Preamplifier Channels: 2 (2.0) Working voltage: AC 5v-16v or DC 6v-20v Board size: 60mm x 45mm Overall height: about 23mm Colour:Black Material:Plastic Package Contents: 1 x Amplifier Board 2 x lotus sockets with 300mm shielded wire Only the above package content, other products are not included. Note: Light 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. Use the special amplifier chip for vinyl record player, the effect is the amplifier board of NE5532 and other op amps. Note: The ground wire of the vinyl machine should be connected to the GND terminal of the amplifier board. Otherwise, there may be interference. The circuit is designed with frequency compensation circuit, the sound frequency band is more balanced, the input signal filter circuit has relatively lower noise, single power supply, with rectifier, filter and stabilizer The circuit uses a dual power conversion chip inside, so that it has the effect of dual power supply under single power supply. (Note: The chip is polished, and the model is not required).