1. Digital tube accurate display, encoder (not potentiometer) regulation is more accurate and stable, longer life 2. Single and double pulses are adjustable, spot welding counting, synchronous triggering, power-off storage 3. The 41A thyristor version can control transformers below 1000W 4. This control board adopts double-sided welding, integrated into a board with more reasonable component layout, in order to be easier to install on the machine casing 5. foot pedal anti-shake function is added, one spot welding is completed once it collapses, preventing mis-spot welding caused by factors such as poor switch contact It must be powered by an AC transformer (AC 12V-17V power supply). It cannot be powered by a DC power supply Specification:A:with 220V to 12V Transformer/B:with 110V to 12V Transformer Color: As shown Material: ABS+Metal+Electronic Components Package Contents: 1 x Motherboard 1 x Sticker 1 x Transformer 2 x 2pin Wires 4 x Screws 4 x Nuts 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.