Capacitor discharge : constant current discharge. Capacitor Capability: V1.0 Capacitor discharge pen can be used on/ 680uF/450V capacitor discharging, generally used on small home appliance repair. The pen tips regardless of the positive and negative poles, the positive and negative poles can be connected freely. Just connect to the two poles of the capacitor. Discharge voltage scope: AC 8-380V/DC 12-540V. Discharge time: less than 4 seconds. Material: Metal colour: black Package Contents: 1 x Capacitor Discharge Pen With LED 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.