The UT12D with high and low dual-mode voltage range detection 24V1000V and 90V1000V, intelligently identifies zero-fire lines. CAT IV 1000V safety level ensures user-safe, audible and visual alarm synchronization, it's an essential tool for industry and home. Features: High and low dual sensitivity AC voltage range of 24V1000V & 90V1000V Detect AC voltage by contacting the power socket or getting near the live wire with non-contact tip. Visual and audible alarm to secure your safety. With flashlight, convenient to use at night or dark corner. Intelligently identifies zero-fire lines, low voltage indication. Automatically turn off when no operation and no detection of AC voltage after 5 minutes. Light weight and mini size allows you to take anywhere anytime. Specifications: Material: ABS High Low Dual Mode Detect Range: 24V1000V(Low Sensitivity, green) / 90V1000V(High Sensitivity, red) Frequency: 50/60Hz Alarm Mode: Sound and light alarm Flashlight: White LED light Auto Power Off: Approx. 5 minutes Low Battery Indication: ≤ 2.4V Drop Test: 1m Zero-fire Lines Distinguish: Yes Power Supply: 2 * 1.5V AAA battery (NOT included) Security Level: CAT IV 1000V Operating Temperature: 0~40 Storage Temperature: -10~50 Item Size: Approx. 150 * 23 * 18mm / 5.91 * 0.91 * 0.71in Item Weight: Approx. 32g / 1.14oz Package Weight: Approx. 52g / 1.85oz Package Size: Approx. 20 * 4.5 * 4.5cm / 7.88 * 1.77 * 1.77in Package List: 1 * Voltage Tester Pen 1 * User Manual(English)