Non-Contact Safety Voltage Tester can be tested without physical contact. The buzzer and flashing light provide simultaneous alerts to increase safety. Insulation operation ensures safe testing. Automatically differentiates between neutral and live lines, suitable for detecting line breaks in 110V and 220V power systems.9 levels of sensitivity to choose from. Voltage range is 12-1000 VAC. During use, the probe's NVC sensor automatically detects voltage intensity. The meter activates the corresponding signal strength indicator based on proximity.Low voltage display: If the battery voltage is lower than approximately 2.6 V, the operation display flashes three times, the buzzer sounds, and the device turns off automatically. Please replace the battery.LCD display and LED flashlight: H/L display intensity, red indicates the highest intensity. The white LED flashlight provides high brightness and low power consumption, illuminating the work area in the dark. Light and probe are combined for easy measurement.Auto Shut-off and Handheld Stylus Hook: After about 3 minutes without operation or signal detection, the voltage detector automatically shuts off to extend battery life and save energy. The convenient portable pencil hook allows for easy carrying.NCV Tester with Adjustable Sensitivity and Portable Pencil Hook.Ergonomic and user-friendly design. Lightweight and compact, this pen-style tester is as easy to carry as a regular pen. The pencil holder design allows you to carry it anywhere. Fits easily in your pocket without taking up space.AC Voltage Tester.Intelligent power consumption reminder.Auto power off: After approximately 3 minutes of inactivity or no signal detection, the voltage detector automatically shuts down to save power and extend battery life.Battery status indicator: Helps ensure safe operation. If the device is not functioning properly, a warning will appear on the LCD screen. Replace the battery promptly to avoid operation failure due to low power.