Non-Contact Voltage Tester, Allows The User To Verify The Presence Of AC Voltage Prior To Working On An Electrical Installation Or During Troubleshooting Without Requiring Physical Contact, Both Audible Beeping, & Visual 360 Degree Flashing Red Light Indicators To Alert The User Of The Presence Of AC Voltage From 50V To 1000V, 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 & Batteries Are Operating Properly, Virtually Eliminating False Negative Readings, 250 LB Crush Rated Impact Resistant ABS Housing To Withstand Tough Applications While The Design Ensures A Positive User Experience, Engineered To Specifications Required By Professional Electricians.