Electricity Tester, for measuring with the electric pen, and as a screwdriver. The screwdriver tip has slots for both type at the ends of the metal rod. When pulling out the metal rod, insert it into the deepest position to achieve full contact.Safety Insulated Pen Body :- The pen body is made of strong insulating material, which is safer to use.Clip Design :- Buckle style clip design, easy to carry and not easy to lose.When using the voltage test pen, it is necessary to insert the screwdriver to the bottom, hold the insulated handle with the thumb and middle fingers, and hold the cap at the end of the voltage tester with your forefinger. The neon tube turns orange light when there is electricity and operate safely.Matters needing attention :- 1. This product should be protected from moisture, and the use environment should not exceed 50 degrees.2. A self-test is required before use, and the equipment can be used normally.3. The body is prohibited from touching the batch head during the live wire detection.