Non-Contact Voltage Tester Pen without Physical Contact, Probe Type Induction, Plastic Insulation Ensures the Safety. Intelligently Voltage Detection With Alarm And Indicator Prompt,Indicators Emits Green/Yellow/ Red,Buzzer Alarms Low/mid/High, And the AC Voltage Signal Is Low/Strong/Strongest Flashlight Under Probe Provide Illumination In Dark, AC 12V-1000V/48V-1000V Dual Voltage Range Detection Switched By Clicking "S" Key, When "S" Lights Up Red, Voltage Detection Is More Sensitive Voltage Tester Detects Line Wire And Null Wire As Well As Break-point Intelligently, Line Wire with Faster Buzzer And Red Indicator Flicking.mini Size With Portable Pencil Hook Is Very Convenient for Carry During Use Voltage Detector Is Powered by 2 AAA Batteries Which Are Included, If the "Switch" Flicking Trice and Buzzer Disappears Means Low Battery, Need Replacement.Voltage Pen Auto Power off If No Operation Or Voltage Detection In 5 Minutes Acousto-optic discrimination of Live or Null Wire: Live Wire Testing: When the sensor end of the measuring pen is close to the object to be measured, the fast-paced buzzing alarm of the tester gives out an alarm sound, and the screen flashes red light, indicating that the test is a LIVE WIRE. Null Wire testing: When the sensor end is close to the object to be measured, the slow-paced buzzer alarms, and the display screen flashes green light, indicating that the tested line is Null Wire. This product has more comprehensive functions: For testing AC Voltage Recognition of Live/Null Wire Triple alarm of sound, light and screen Energy-saving and bright LCD screen High and Low Voltage Signal Indicator Buzzer alarm - loud and sensitive White LED lighting - - energy saving, convenient Auto power off Switch key Good Sensitivity of NCV Sensor Dual Range ofAC Voltage: 48V-1000V/12V-1000V Frequency: 50Hz / 60Hz Alarm Mode: Sound and light alarm Electric Torch: LED illumination Low-voltage indicator lamp: Yes Security Level: CAT. III 1000V / CAT. IV 600V Service Temperature: 0-40 Storage Temperature: -10-50 Altitude: Less than 2000m colour:black Material:ABS size:19*4*4cm Package Contents: 1 * Electric Tester Pen Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.