Application: Single signal inverter board, dual signal inverter board, inverter compressor, single damper, double damper, pulse solenoid valve, 12V electrical ing valve, DC-fan. Output voltage: 220V Electrical throttle detection: Connect the damper detection line to the damper motor interface in red, yellow, blue, and white order as shown in the figure. Note: The default program is a single damper. Press the damper button, the damper indicator light will light up, and the display screen will display 176. When the damper is fully open, the damper indicator light off. Press the damper button again, the damper indicator will light up, and the display screen will display 176. When the damper is completely closed, the damper indicator light off. If the damper opens and closes smoothly, it indicates that the air door is normal. If the damper does not rotate, does not open or close smoothly, or if there is a problem, it indicates that the damper has failure. Note:due to different production batches, the wire styles and colors are random, and the designation is not accepted. Colour:Blue Material:ABS Package Contents: 1 set * Refrigerator Compressor Detector 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.