Welcome to the store! AD584 User Manual: Input DC 12V-24V voltage on the left side, you can connect it from the terminal, or you can directly use the router's power supply to plug into the DC socket and use the multimeter test cable to plug it directly on the right side. If you can't plug it in, adjust the screw. Just connect the shorting cap to the corresponding jumper. It is an AD584KH reference voltage circuit board. It can be used to calibrate the multimeter. Function: 1) It uses copper terminal and the multimeter test pen can be inserted directly. 2) It can select output voltage value through the shorting cap. 3) Input power can use router power and connect it directly to the DC socket. Parameter: 1) Product Name: AD584JH Reference Voltage Circuit Board 2) Input Voltage: DC 12V-24V 3) Output Voltage: DC 2.5V/5V/7.5V/10V 4) Working Temperature: -25℃~85℃ 5) Working Humidity: 5%~95%RH Note: Depending on the batch, the color of the jumper cap on the board may be random, the specific color cannot be selected. And the numbers written on the board may be different, which does not affect the use. Material: PCB Color: green Package Contents: 1 x AD584KH Reference Voltage Circuit Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be a little different from the real thing. The measurement allowed error is +/- 1-3 cm. Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!