Adjustable sensitivity & Dual Range TestingThe sensitivity is adjustable and the measurement is more sensitive and flexible; The voltage tester has dual range and the sensitivity can be adjusted as needed. Press the S button to switch the AC voltage range between 12V-1000V and 48V-1000V. Non-contact and safe voltage detectorThe test can be performed without physical contact and the isolation process ensures test safety. This brand new test pen is easy to use, just touch the power outlet or stand near the live wire. Sound and light alarm & LED flashlight. A high-brightness, low-power white LED flashlight helps illuminate the work area in the dark; Lighting lamp and probe are combined, convenient for measurements. Compact designAutomatic detection of the test pencil after switching on. Automatic shutdown when no operation and AC voltage detected. The pocket-sized pen hook allows you to carry it in your shirt pocket. Low battery indicatorWhen the battery voltage is below 2.6 V, the operation indicator flashes three times, the buzzer sounds, and the detector automatically shuts down. Please replace the battery in time. If there is any problem, please contact us.