Taiss Non-Contact Voltage Tester Pen with LED Flashlight and GFCI Outlet Tester with Voltage Display 48-250V Automatic Electric Circuit Polarity Voltage Detector Wall Plug Breaker Finder

Bright Led Display - Light patterns are well labeled on the back of the device itself. The Red LED indicators can be light up clearly even in strong sunlight. The tester incorporates a built-in light so it can also be used in the dark, making you read it fast ;Special attention: when using this product?1: Please check whether the battery is installed correctly. (There is a correct battery installation diagram on the product) 2: To turn on the electric pen, please hold down the power supply for about 2 seconds and do not loosen it.