Non-contact voltage detector-The insulated housing of the voltage detector ensures safety. Testing can be carried out without physical contact and the isolation operation ensures safe testing. Portable pen-shaped design The voltage detector stylus is designed in a pen shape with a clip for pen. It attaches easily to your pocket and many other places, allowing you to take it with you during repairs and make your job easier. Adjustable Sensitivity -The sensitivity is adjustable, which makes the measurement more sensitive and flexible. Press the S button for 3-level sensitivity adjustment. One beep indicates low sensitivity, two beeps indicate medium sensitivity, and three beeps indicate high sensitivity. You can adjust the sensitivity according to your needs. It meets many needs in residential, commercial and industrial settings. Audible alarm and security lighting: Distinguish between on-site and off-site with alarm sounds of different frequencies. The higher the voltage, the higher the frequency of the audible alarm and the frequency of LED flashes. A white LED flashlight helps illuminate your work area in the dark. Note -Range: 12-1000 V AC 50/60 Hz EN61010-1/1000 V. The pen requires two AAA batteries to operate. For transportation safety reasons, our pens do not include batteries. [Product size] 155*50*24mm, There may be slight differences in color, please refer to the actual item received!