For the NY-D01 spot welder control panel, this digital display adjusts time and current. Imported STM single-chip microcontroller controls, precise zero-crossing detection and triggering, ensuring precise control. Optocouplers isolate strong and weak currents for safer operation. The time and current display is clear at a glance. Time displays range from 01-50 in cycles (one cycle is 20 milliseconds); current displays range from 30-99 in percentages, which can be interpreted as controlling the percentage output of the load transformer. The time and current adjustment knobs (potentiometers) are included: turn left for smaller values and right for larger values. A knob cap is included (cap color is random). Product Name: Spot Welder Control Board Model: NY-D0T Power Supply: AC 9-12V 3W 50Hz/60Hz (Must use AC power, for DC cannot trigger) Trigger Type: Imported optocoupler for thyristors Display Type: 0.36 digital tube Adjustment Type: Potentiometer/Knob Time Range: 1-50 Current Range: 30-99 Welding Output: Single Pulse Number of Standard Groups: 1 Dimensions: 80 x 60mm Weight: Approximately 69g Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.