Sensitivity adjustable: AC 12V-1000V/48V-1000V dual range, different ranges can be selected as needed Measurement range: supports voltage testing across two ranges; wire and neutral can be distinguished by alarm sounds of different frequencies; default AC voltage measurement range is 48-1000V, and 12-1000V can be measured by adjusting sensitivity Non-contact: non-contact voltage tester that detects AC voltage within the specified range; emits LED light and beep sound without touching the object, supporting safe testing practices LED display: includes LED light and low voltage indicator; low voltage LED and warning light alert for timely battery replacement; white LED provides visibility in dark environments; auto power-off after 5 minutes to conserve energy Safe to use: features audible and visual alarms; uses buzzer and LED indicator to distinguish voltage frequency; sound is audible in typical working environments