Southwire Pen style voltage tester AUDIBLE AND VISUAL INDICATION of AC voltage on two ranges: 24 to 600v and 100 to 600v INCREASED BATTERY LIFE: the auto power off feature increases the battery life by powering off after 5 minuets of inactivity Green LED indicates tester is ready for use BUILT-IN FLASHLIGHT: this non contact AC voltage detector features a built-in flashlight for user convenience in dim lighting