Describe In NCV mode, move the instrument for testing. When the instrument detects and the screen displays "one L,,", the red backlight lights up and V is emitted. The sensing probe gradually approaches the area where strong electric field signals are detected, and the green backlight turns on, indicating that strong electric field signals are detected. Strong electric field signal. There is a "ding" sound and " Liveness Detection When VE mode is selected, connect the red probe to the test point or insert. When the instrument detects a weak signal, the green backlight lights up and the screen displays "---L,". When the instrument detects a strong signal, the red backlight lights up and a rapid beep sounds. The screen displays "--H" Specification Power supply: 2 × 1.5V AAA batteries (battery not included in product) Product weight: about 66.9g Product size: 136.2X44.5X32mm (line length 60mm) Package includes: 1*HT93 smart multimeter Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin