Ensure safety: detect voltage without contact, high sensitivity. It flashes and emits a B IP when the device is close to AC voltage. Allows you to safely detect voltage without an electrician or professional. Widely applicable for hobbyists, beginners and home users, it can satisfy the many needs of residential, commercial and industrial environments. LED function and auto-off: The non-contact voltage tester is equipped with a flashlight that can be used in the event of a power outage or in a dark environment. Auto-off function after 3 minutes of inactivity allows you to save and control energy. Adjustable Sensitivity and Dual Range: VT02 Voltage Tester can detect voltages in two voltage ranges : 12V-1000V / 48V-1000V (adjusted by "S" key). The probe's NVC sensor recognizes the voltage and displays it on the LCD screen. Non-contact voltage tester: Non-contact test; insulated pen body ensures safety test; Can be used to test AC voltage, auto detect firewire or zero line; As long as the AC voltage is close to the test object, the tester beeps. LCD Display and High Voltage Alert: During the test, the voltage intensity is displayed on the screen. The screen will light up in red or green. If the red light is flashing, a fast tempo alarm indicates firewire is detected. If the red light does not flash, it means that the zero line is detected.