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.