Adjustable, Non-Contact Voltage Tester, User Can Verify The Presence Of AC Voltage Prior To Working On An Electrical Installation Or During Troubleshooting Without Requiring Physical Contact With Live Electrical Conductors, Allows For Sensitivity Adjustments In Multiple Wire Applications When Precision & Safety Are Crucial, Adjustable Sensitivity Dial Able To Detect The Presence Of AC Voltage From As Low As 12V To Up To 1000V AC, Provides Both Audible Beeping & Visual 360 Degree Flashing Red Light Indicators To Alert The User Of The Presence Of Voltage, Built In Flashlight, Fully Insulated Probe Tip Eliminates The Risk Of Contacting Live Electrical Wires While The Patented Battery Check Feature Designed Into The Unit Ensures Tester & Battery, Engineered To Specifications Required By Professional Electricians.