1、Humanized pen holder, when not measuring, the electric pen can be hung on the clothes at any time and carried with you. 2、Flashlight illuminates for you, allows you to see the measurement position clearly in a dark environment. 3、One‑key sensitivity switch, can switch between high sensitivity and low sensitivity, high sensitivity range is 12‑1000V, low sensitivity range is 48‑1000V. 4、NCV sensor head, strong and not easy to break, more accurate detection. 5、The voltage pen tester detects voltage in a non‑contact way, so do not worry about there could be any possibility of being shocked by the electricity. Condition: 100% Brand New Material: ABS Color: As shown in the picture Alarm Mode: Sound and light NCV Sensitivity: High, medium, low Use Environment: Working Temperature: 0-40℃ Storage Temperature: -10-50℃ Humidity: ≤95% Altitude: ≤2000 meters Security Level: CATIII 1000V CAT IV 600V: CE Power Supply: 2x1.5V AAA battery (not included) Weight: Approx.48g/1.7oz Operating Instructions： Power on/off： Press the POWER button and keep the POWER on for more than 1 second. The display shows "POWER" to enter the test state: press the POWER switch to shut down when the POWER is on. High and low sensitivity switching： Switch between high sensitivity and low sensitivity by pressing the sensitivity/flashlight button (less than 1 second) : Sensitivity refers to the state of high sensitivity test when the indicator light "S" is on, or low sensitivity test when it is off. High sensitivity range: 12-1000V Low sensitivity range: 48-1000V Flashlight: Press the sensitivity switch/flashlight button and hold for more than 2 seconds to turn the flashlight on. Press the sensitivity switch flashlight button again and keep it greater than 2 seconds to turn off the flashlight. No induction signal and no operation will turn off automatically after about 3 minutes. 1 x Voltage Detector 1 x Instruction Manual