: It will send out multiple alarms by sound and light. The tip glows red and beeps when voltage is detected. The higher the sensed voltage, or the closer it is to the voltage source, the higher the beep frequency it emits. At the same time, the screen displays red or green, red means that high voltage and live wire are detected, green means low voltage and neutral wire are detected. Non-Contact: Induction probe with AC voltage; simply place the tip near a power strip, outlet, or power cord. You'll know there's voltage when the tip glows red and the pen beeps. The live wire detector can automatically detect the live or neutral wire. perfect for breakpoint testing. Portable circuit tester for electricians, homeowners. Dual Range: Detect standard voltage and low voltage (12-1000V AC / 48-1000V AC) for more sensitive and flexible measurements. Press the S button to adjust sensitivity and adapt to low range on doorbells, thermostats, irrigation lines, and more; the sensor automatically recognizes the voltage and displays it on the bar . Safety level: EN61010-1, -2-030; EN61326-1, CATIII100V; Electrical tester adopts safety double insulation. The high voltage alarm warns you of voltages above 90V, the screen turns red and the on-screen safety symbol flashes. design: bright LED flashlight, suitable for working in environments; power indicator light when the battery voltage is lower than 2.5V; automatic shutdown after 3 minutes of no operation or detection signal; pocket-sized pen hook allows you to put it in the shirt pocket. Colour:As Shown Material:ABS Size:15.5x2cm Package Contents: 1 * Digital explicit response electrical pen 2 * 1.5V AAA battery 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.