1、HIGH SENSITIVITY: With advanced sensing technology, the tester pen can easily and accurately measure the voltage, making all kinds of electrical repair and installation work more convenient. 2、LED COLOR LIGHT: The unique design of the test pen with built in LED high brightness color light can be used in dark light environment, which greatly increases the range of use and convenience. 3、DROP PROOF AND WATER RESISTANT: Unlike traditional electrical tester pen, this test pencil is specially reinforced with a drop proof and water resistant case, which maintains good working performance even under harsh working conditions. 4、TRANSPARENT CASE: The part of the electric pen is made of high transparent material, you can see the internal structure clearly, which brings you a new and unique using experience. 5、EASY TO USE: LED electric pen is compact and easy to operate, whether it is a professional electrician or home maintenance can be easily mastered, it is your ideal assistant for electric work.