Electrical Tester Ideal for Testing Power Cables, Circuit Breakers, Wall Outlets, Junction Boxes and Fuses - Once the voltage is detected, the tip lights up in flashing red indicates the presence of voltage and the device beeps - Test voltage range: 90V-1000V AC - Safety rating: CAT III 1000V - IP rating: IP54 - Power supply: 2 x AAA batteries (1.5v) Inlucded Features : LED in the voltage tester pen can illuminate the working area. Small and compact pen design for easy carrying Cleaning: clean with damp cloth This instrument is only used to judge whether the conductor is live or not. Ideal for testing AC cables, circuit breakers, wall sockets, junction boxes, fuses, etc. All outer surfaces are non-conductive for safety Touch the wire with the pen tip. If the red indicator lights up, it means voltage exist. Detects voltage without metallic contact. Voltage Sensitivity: 90~1000V AC (never test the voltage which is more than 1000AC) Auto power-off: Yes Low Battery Power Indication: Yes Operating Temperature : -10°C ~ 50°C Storage temperature: -10°C ~ 50°C Frequency Range: 50 to 500 Hz Material: ABS Plastic Color: Yellow & Black Safety Rating : CAT II 1000V Item size: Size: 15.3 x 2.5 x 1.5 cm Net weight: 45g Power by: 2 x 1.5 V AAA batteries(Included) How to Use : Just press the button, white LED light can be always on when there is absence of voltage. “Beep” sound and red flashing LED would indicate the presence of voltage. Touch the wire with the pen tip. If the red indicator lights up, it means voltage exist. Package included : 1 x LED Light Voltage Alert Pen 2 x AAA Batteries