Features: Induction alarm: The built-in sensor of the test pen when detecting the nearby AC voltage the red light will flash and give an alarm sound. Non-contact: The non-contact voltage tester is safer without contacting wires or electrical appliances. Self contained flashlight: The probe on the voltage tester and the two in one lighting lamp can be operated clearly in case of insufficient light. Judgment of line breakpoint: When the line is electrified the line is open one section of the wire is electrified and the other section is not (or may have a weak voltage) the breakpoint can be detected. Humanized pen clip: The humanized pen clip on the back of the voltage tester can be conveniently clamped on the belt or pocket. Usage method: 1. Prepare the voltage tester and battery 2. Press down and pull out according to the tail instructions 3. Put the battery into the battery compartment with the positive pole toward the tail and the negative pole toward the pen tip 4. Press and hold the middle of the battery and then fasten the red cover. The installation is successful Specifications: AC voltage: 90v-1000vca Live line and neutral line: Sound light prompt Power supply: 2 AAA batteries Frequency: 50hz/60hz Alarm mode: Sound light Probe type: Flat Safety class: Cat III1000V Size: 153*25*19mm includes: 1 * Tester (without battery) "