Features: Intelligent Voltage Tester: detect AC voltage by contacting the power socket or getting near the live wire with non-contact tip. High and Low Sensitivity Adjustment: dual sensitivity AC voltage range of 12V~1000V & 48V~1000V with switching S button. Zero and Live Wire Distinguished: you can recognise the zero and live wire according to the signal intensity detected, the one with strong signal is live wire. Auxiliary Illumination: with flashlight function for lighting up the working area at night. Auto Power-off: automatically turn off when no operation and no detection of AC voltage after 5 minutes. Low Power Consumption: powered by 2pcs 1.5V AAA batteries(NOT included), and it has low battery indicator when the battery voltage is less than 2.5V. Specifications: Material: ABS AC Voltage Detecting Range: 12~1000V, 50/60Hz Operating Temperature: 0~40 Storage Temperature: -10~50 Humidity: ≤95% Altitude: ≤2000m Safety Compliance: CAT III 1000V, CAT IV 600V Power Supply: 2 * 1.5V AAA battery (NOT included) Item Size: 145 * 27 * 24mm / 5.71 * 1.06 * 0.94in Item Weight: 32g / 1.13oz Package Weight: 47g / 1.66oz Package Size: 15.5 * 3.5 * 3cm / 6.10 * 1.38 * 1.18in Packing List: 1 * Test Pen 1 * Manual (English)