Sensitivity adjustable: AC 12V-1000V/48V-1000V dual range, different ranges can be selected as needed Measurement range: different voltage test and double test range, wire and neutral can be distinguished by alarm sounds of different frequencies; the default AC voltage measurement range is 48-1000V, and 12-1000V can be measured by adjusting the sensitivity Non-contact: non-contact voltage tester, when the device is close of AC voltage within the specified voltage range, it emits LED lights and beep sound without touching the object under test to support proper safety measures LED display: LED light and low voltage indicator, low voltage LED and warning light to remind you to replace the battery in time, white LED light can work normally in dark environment; no automatic operation for 5 minutes to save energy Safe to use: safe sound and light alarm, distinguish voltage frequency with buzzer and LED indicator. Its sound is enough to hear the noise of medium-sized machines