Features Good Matching: Able to work with digital amplifier, this preamp module will bring you more listening enjoyment. Practical Use: Enabling simple operation in audio amplification as well as adjustment in high, medium and bass. Dual Channels: Adopting dual core NE5532 chip, the dual channel preamplifier board has high working efficiency. Reliable Work: Works stably under DC 12V-24V, the preamp module allows for better tone control to meet your needs. Easy to Install: Comes with a light weight and a compact size, also has 2pcs connecting cable for installation. Specification: Item Type: Preamp Module Material: PCB Supply Voltage: DC 12V-24V Number of Channels: Dual Channel Package List:1 x Preamp Module2 x Connecting Cable Package List 1 x Preamp Module 2 x Connecting Cable