SAFETY FIRST It 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 voltage detected or the closer it is to the voltage source, it beeps at a higher frequency. NON-CONTACT With inductive NCV probe for alternating voltage; Simply place the tip near a terminal block, outlet, or power cord. When the tip lights up red and the stylus beeps, you know there is voltage. The live wire detector can automatically detect live or neutral wire. DUAL RANGE Detects standard and low voltages (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 LEVEL The display will show red or green. Red means high voltage and live wire are detected, and green means low voltage and empty wire are detected. COMPACT DESIGN Bright LED flashlight for working in dark areas; The pocket sized pen hook allows you to 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: the S key can change sensitivity LCD screen: display of the red live wire / zero wire or display of the green earth wire / p Operating temperature: 0-40 Storage temperature: -10-50 , humidity: 95% Altitude: lt; 2000m Battery: 2 * AAA batteries (not included) Item size: 155 x 23 x 20 mm / 6.1 x 0.9 x 0.8 in Item weight: 46 g Package size: 160 x 25 x 22 mm / 6.3 x 1.0 x 0.9 in Package weight: 52 g Packing list: 1 * Tester 1 * Manual Note: this does not include other things, the color is based on the first picture, and other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item . Due to manual measurement. Please allow deviation. Thank you!