Item Type: Sound Operational Preamplifier BoardMaterial:PCBProduct Model: XH A902Chip Model: NE5532Number Of Channels: Dual ChannelAmplification: 5XPower Supply: DC 12-30VPackage List5 x Sound Operational Preamplifier Board5 x Connection Cable1CLEARER SOUND: Sound operational preamplifier board uses the original imported op amp chip, compared to similar op amp sound more pure bottom noise is smaller. 2SOUND PREAMP: Digital tone board needs to be connected to the amplifier at the sound output end, and then the amplifier will be connected to the speaker to have sound. 3WIDE VOLTAGE INPUT: NE5532 amplifier front panel is suitable for all sound amplifier preamp source amplification. Wide voltage input, the input voltage is DC1230V. 4NOTE: Connect DC1230V power supply at the power input of the amplifier board, pay attention to distinguish between positive and negative, VCC is positive. 5PCB MATERIAL: Sound operational preamplifier board module is made of PCB material, which is durable and not easy to damage. Widely applicable, easy to use.