The pocket-sized voltage tester Fluke's new generation of VoltAlert™ non-contact AC voltage testers are easy to use — simply touch the tip to a contact strip, receptacle or live wire. When the dot lights up red and the device beeps, you know there is power. Electricians, maintenance, service and safety personnel, and homeowners can quickly test whether there is power on a circuit at home or in the workplace. - Voltbeat™ technology and continuous self-test — so you always know it's working - When voltage is detected, the tip lights up and beeps - CAT IV 1000 V for extra protection - Extended range: 200 V to 1000 V AC - Two-year warranty