Features: With LED indicator and beep sound in one Use a high-quality pen holder, and the part of the pen is wrapped with a rubber sleeve to prevent accidental contact and short circuit. The pen tip can be removed, if the wire is broken in use, it is easy to connect. The circuit design is reasoble, 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. Package include: 1 High Voltage Capacitor Discharge Pen with LED & Buzzer