FeaturePower socket,wall AC power socket,voltage detector,sensor tester pen,90-1000V.just touch the tip to the terminal block, socket or power cord. When the pen tip glows red and the device beeps, you know that there is voltage. Electricians, maintenance, service, security personnel, and homeowners can quickly test energized circuits in the workplace or home. The perfect tool kit for home and power industry. Ideal design for testing power cords, circuit breakers, wall sockets, junction boxes, fuses, etc. Just press a button. When there is no voltage, the white LED light can always be on. And the red flashing LED indicates that the voltage is completely insulated, no exposed metal or conductive parts, long life, low power consumption, compact, safe and easy to carry.Specification:Frequency range: 50-500 HzTest voltage range: 90-1000V ACPower supply: 2 x AAA batteries (not included)Material: ABS plasticplasticColor: Yellow,BlueProduct size: 139 * 25 * 16.8mm/5.47*0.98*0.66"Package Included:1 x Tester PenNotes:1. Please allow 1-3 cm difference due to manual measurement and 3-5 g for the difference between different colors.2. Due to the screen difference, the color may be a little different from what you expect, please allow it.