LVD1 Is A Non-Contact Ac Voltage Detector and Led Flashlight Combined In One Convenient, Compact Design. With Exclusive Dual-Sensitivity - The Voltage Detector Glows Blue When It'S Near Ac Voltage, and Glows Red When It'S At The Source. Detects Voltages From 40 V Ac to 300 V Ac. Voltage Detector Glows Blue 50 HZ - 60 HZ or 2.5 - 38 CM (1 - 5 In) Away From Source. Operating Temperature 0°C to 50°C. Ultra-Bright White Led With 100, 000 Hour Bulb Life. AAA Battery Included.