SAFETY FIRSTIt will send multiple alarms by sound and light. When voltage is detected, the tip will send out a red light and beep. When the higher the detected voltage or the closer to the voltage source, it will beep at a higher frequency. NON-CONTACTWith NCV inductive probe for AC voltage; Simply place the tip near a terminal block, outlet or power cord. When the tip glows red and the pen beeps, you know there is voltage.The live wire detector can automatically detect the live or neutral wire. DUAL RANGE Detects standard and low voltage (12-1000V AC / 48-1000V AC) for more sensitive measurements and flexible. Press the S button to adjust the sensitivity and adapt the low range for doorbells, thermostats, irrigation wiring, etc. ; The NCV sensor automatically recognizes the voltage and displays it on the bar graph. SAFETY LEVELThe display will show red or green. Red means high voltage and live wire are detected, and green means low voltage and open wire are detected. COMPACT DESIGNBright LED flashlight for working in dark areas; Pocket-sized pen hook lets you carry it in your shirt pocket. Specifications: Material: ABS+PC Model: T8901 AC detection range: 12V-1000V/48V-1000V Phase sequence test: measurable Alarm mode: sound and light alarm/display indication Flashlight d Lighting: White LED lighting NCV acuity: S key can change sensitivity LCD display: Red live wire display/Zero wire or Green ground wire display< /p> Operating temperature: 0-40 Storage temperature: -10-50, humidity: 95% Elevation: