AC voltage: 12V - 1000V Frequency: 50/60Hz Alarm mode: Sound and light instruction Low battery indication Auto power off Features: Premium Quality:With transparent PC protective cover, the NCV sensor is solid and sturdy to use, delivering accurate detection result. Variable Sensitivity: AC voltage detection can be switched between high and low sensitivity for different circumstantces. Live/Null Wire Detector: Non-contact detects the live/null line and alerts you with a beeping sound and flashes. Continuity Tester: Quickly checks shorts or broken circuits in all types of electrical devices. LCD Display & Flashlight: The clear LCD screen makes you catch the values at a glance, and flashlight enables good visibility in the low-light or dark area. Easy Portability: Compact size and pen clip design make it portable, clip it to anywhere you are easy to reach such as shirt pocket, sleeve or notebook.