Safety and security: The non-contact voltage tester has passed CAT III 1000V and CAT IV 600V test certification. When the AC test pen detects voltage, the probe will flash red and beep; the higher the detected voltage or the closer to the voltage source, the higher the beep frequency. The AC outlet tester provides yellow flashes for low voltage and neutral triggers, and red flashes for high voltage and live triggers.Non-Contact: The AC circuit tester uses non-contact technology to measure voltage, utilizing an NCV inductive probe to detect AC voltage. Simply hold the tip of the tester near an outlet or power cord to detect voltage presence. This dual-range voltage detector features double insulation for safety, reducing the risk of electric shock. It is safe and ideal for identifying live or neutral wires and for breakpoint testing.Dual Range: The current tester detects two voltage ranges (12-1000V AC and 48-1000V AC), allowing for more flexible and accurate measurements. NCV sensitivity automatically adjusts from low to high. Low sensitivity is suitable for detecting low-power devices such as doorbells, thermostats, and power strips, while high sensitivity is ideal for power supplies. Use the non-contact wire tester wherever needed. Visual and audible indicators clearly show voltage detection.Circuit inspection testers are equipped with bright LED lights to assist in low-light environments. The AC cable voltage tester includes a spotlight feature to help locate wiring over long distances. The device automatically powers off when battery voltage drops below 2.4V or after 5 minutes of inactivity to conserve energy. The pocket-sized design includes a pen clip for easy carrying.Efficient: The live voltage tester can be used to test lighting fixtures, switches, sockets, and other electrical components. Simply press and hold the red button for 2 seconds to activate. Ideal for electricians and home users, the socket voltage detector emits a high-voltage alarm when voltage exceeds 90V. The NCV probe voltage detector is a reliable tool for appliance repair and circuit diagnostics.Color: Black Material: Plastic Package Contents: 1 x Voltage Test Pen Note: Light and screen display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.