Safety First: It will send multiple alarms by sound and light. When voltage is detected, the tip emits a red light and beeps. When the sensed voltage is high, or the closer it is to the voltage source, it beeps at a higher frequency. At the same time, the screen will be red or green, red means high voltage and live wire are detected, green means low voltage and bare wire are detected. Without contact: with NCV inductive probe for AC voltage; simply place the tip near a terminal strip, outlet or power cord. When the tip glows red and the pen beeps, you know there is voltage. The live wire detector can automatically detect the live or neutral wire. Ideal for breakpoint testing. Handy circuit tester for electricians, homeowners. Dual Range: Detects standard and low voltage (12-1000V AC/48-1000V AC) for more sensitive and flexible measurements. Press the S button to adjust the sensitivity and adapt the low range for doorbells, thermostats, irrigation wiring, etc. The NCV sensor automatically recognizes the voltage and displays it on the bar graph. Security level: IEC rated CAT III 1000V CAT IV 600V, meets CE requirements; the electrical tester is safe double insulated. High voltage alert to warn you of voltage above 90V, the screen will turn red and the safety symbol on the screen will glow. Compact design: bright LED flashlight for working in harsh conditions weak; low power indicator when battery voltage is lower than 2.5V; auto power off after 3 minutes without operation or signal detection; pen pocket hook lets you carry it in your shirt pocket. We provide 36 months after-sales service, please feel free to contact us if you have any questions. Size: 159*21*20mm Color: red black Quantity: 1 piece