Features Changeable Amplification: The amplification is 4.7 times, you can change the 47K resistor near the op-amp to change the amplification, 22K is 2.2 times, 100K is 10 times. Excellent Performance: The chip driver board adopts high performance inductor and high performance capacitor, with strong anti-interference ability and stable performance, and the input signal is completely isolated from the output signal. Easy Wiring: Product quality through testing, small size, light weight, easy wiring, amplifier board working voltage DC12V-15V, transformer power of 5W or more, stable and durable. Stable PCB: High quality PCB material with reliability and miniaturization, good maintenance and interchangeability. Quality Assurance: We value every customer's shopping experience and satisfaction, so after your purchase, no matter what problems you have, please contact us first and we will try our best to solve any problems for you. Specification: Item Type: Chip Driver Board Material: PCB Working Voltage: DC 12V-15V Transformer Power: More than 5W Package List: 1 x Chip Driver Board Note: Pay attention to correct operation. Package List 1 x Chip Driver Board