Features: Discrimination of zerofires line: touchthe touchpole with a pentip, where high voltage is the firelines and low voltage is the zerolines. Acvoltage, display buzzer alarm. When measuring ACvoltage, the pen tip touches the livewires and the hand touches the touchelectrode on the side to measure the voltage, the simulated earth of human body varies from personto person. Zerofires line identification, fast and highly sensitive distinction. Zerofires line identification, touchthe touchpole, insert the nib metal into the hole, the red screen is the fire linewith rapid buzzer sound, and the green screen is the zerolines with weak voltage and no alarm sound. Led lighting function. With led flashlight lighting function, no matter what environment, it can clearly illuminates, eliminating the danger of electric shock and assisting night measurement. Two-colors digital display color screen, realtimeprompt. Two-color screen, warning sound prompt, two-color to distinguish zerofires line, fast resolution. Green is judged as zerolines, and red is judged as firelines. A word batchhead, high hardness, solid and more durable, screw atanytime. The pencil holder design makes it more convenient to carry around. The detachable pen cap can prevent electric arcfrom creeping. Specifications: Material:Plastic Size:Approx.16.64x2.96x1.8cm/6.55x1.16x0.7inch Color:Red/Black Model:VD807 Measure Ranges:12-300Volt Net Weight:33g Frequency:50hz/60hz Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1 Set Voltage Detection Pen