CAT IV NCV Detector with visual/audible indicator and built-in Flashlight The DV26 is a Non-contact Voltage Detector with a (built in) Flashlight. It detects AC voltage from 100 to 1000 VAC without contact and alerts the user with LED's and audible beeping. The DV26 is built in a rugged double molded housing, has a CAT III 1000V/ CAT IV 600 Volt safety rating and is complete with a year warranty and two AAA batteries.