The LED light provides long lasting while the buzzer alerts users to potential hazards Strong adsorption to improve efficiency The strong designs of the head can adsorb screws and small metal parts to improve work efficiency Designed for electricians, maintenance personnel, and home users who need to and measure circuits This LED high brightness buzzer sensing voltage tester pen features a bright LED light and a buzzer, making it easy to detect voltage Identify the live wires: the live wires on, the 0 wire is off, Manufacturer: XIAOQENAN