b' Easy to carry in your shirt pocket and with continuous self-test so you always know it s working, this voltage tester pen, non-contact voltage detector allows you to quickly test for energized circuits in the workplace or at home. The Volt Alert AC non-contact voltage testers is easy to use. Feature - Non-contact detection of standard voltage in cables, cords, circuit breakers, lighting fixtures, switches, outlets and wires - Automatically distinguish the Zero Line and Fire line. - Sound and LED alarm, Sound and light instructions. Auto power off - Automatic selection of 2 kinds of sensitivity. - Scope of application: suitable for detecting12-250v ac and dc current and simply detecting zero line, phase line and breakpoint of ac current, as well as non-live conductor and on-off Circuit on-off test - Press the inductive breakpoint test button, the charged symbol is the phase line, if there is a breakpoint in the live circuit, move the test pen, the point where the charged symbol disappears is the break point - Warm Tip: Dear buyer, Due to lighting effect,monitor s brightness,manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. sincerely hope that you can understand Specifications: - Color: Red+Black - Material: Plastic - Size: 15.6 x 2.62 x 2.62cm