【Non-Contact】 The voltage tester pen uses an NCV inductive probe for AC voltage. Bring the tip close to the socket, junction box, or power cord. It can detect whether there is current without direct contact with the charged body, which greatly reduces the risk of electric shock and is safer. 【High/Low Sensitivity Setting】 The default sensitivity of the voltage tester is 48V~1000V (low sensitivity). Press "H/L" to switch to 12-1000V (high sensitivity). It can be switched according to the situation, making the measurement more sensitive and flexible. 【Visual and Auditory Indicators】 The electrical tester can issue various alarms via light and sound. When the detected voltage is higher or closer to the live wire, the indicator light turns red and is accompanied by a rapid beep. When it is close to the neutral wire or away from the voltage device, the indicator light turns orange and is accompanied by a slow beep. 【Practical Design】 The voltage detector comes with an LED flashlight and an infrared light. The flashlight allows you to easily measure the voltage in a dark environment, and the infrared light helps you locate it easily. The voltage detector is small in size and has a pen clip design, which is very convenient to carry. 【Wide Application】 The non-contact voltage tester is suitable for detecting wires, electrical appliances, distribution boxes and other equipment in various environments such as home, industry and commerce. Both home users and professional electricians can benefit from it.