Features:Self checking function: the electric pen passes through the human body circuit and will emit a green bright light. Self checking is required before use.Convenient pen holder: the convenient pen holder design of the electric pen is easy to hang and carry.For your safe: it will send out alarms through light. When the voltage is detected, the tip will send out light. Detection range: this electric pen39;s detection range is of 24-250v, wide range for multiple usages. Rust proof: this electric pen adopts high quality material which will avoid rust well.Specifications:Material: ABS, CR-V Alloy Steel Size: Length-14cm Head-2.1cmDetection Range: 24-250VProduct Process: Bicolor LED Package List:1 * Voltage Tester Electric Pen