Features:✓ Frequency Range: 50 to 500 Hz✓ Just press the button, white LED light can be always on when there is absence of voltage✓ A perfect tool kit for home and electric industry uses✓ Totally insulated, no exposed metal or conductive parts✓ Safety Rating : CAT II 1000v✓ Test Voltage Range: 90-1000V AC✓ The next generation AC non-contact voltage testers are easy to use — just touch the tip to a terminal strip, outlet, or supply cord. When the tip glows red and the unit beeps, you know there is voltage present. Electricians, maintenance, service, safety personnel, and homeowners can quickly test for energized circuits in the workplace or at home.✓ Long life and low power consumption✓ Electric Socket Wall AC Power Outlet Voltage Detector Sensor Tester Pen 90-1000V✓ Ideal design for testing power cables, circuit breakers, wall sockets, junction boxes, fuses, etc✓ "Beep" sound and red flashing LED would indicate the presence of voltage✓ Compact, safety, & easy to carrySpecifications:Item size: 152*23*15mm✓ Color: Yellow & Grey✓ Package size: 204*91*19mm✓ Net weight: 45g✓ Material: ABS Plastic✓Requirement : AAA BatteriesPacking Content:✓ 1 x LED Light Voltage Alert Pen