Non-Contact Voltage Tester Detects Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets, and Wires, High Intensity, Bright Green LED Indicates the Tester is Operational and Aids in Illuminating the Workspace, When Voltage is Detected, a High Intensity, Bright Red LED Illuminates and a Beeping Sound is Generated, Auto Power-Off Feature Conserves and Extends Battery Life, 50 to 1000V AC Power Operating Range Allows Broad Application, Receptacle Tester is Designed to Detect the Most Common Wiring Problems in Standard Receptacles: Open Ground, Reverse Polarity, Open Hot, Open Neutral, Hot/Ground Reversed, Kit Comes With NCVT1P Non-Contact Voltage Tester, RT205 GFCI Receptacle Tester, Instructions, and All Required Batteries