The Milwaukee Voltage Detector Can Be Used For Residential, Commercial and Industrial Applications. The 2200-20 Is A Rugged Tool With The Highest Safety Rating In The Industry, Cat Iv 1000 V With A Wide 50 to 1000 Volt Ac Range. The 2200-20 Also Has A Green Light Which Is Lit When Battery Power Is Available, to Dramatically Improve Safety On The Jobsite. A Blinking Red Light and Loud Beeper Also Indicate The Presence Of Voltage. Includes Two (2) AAA Batteries and Instructions; Covered By 1 Year Warranty. N