Professional SAE Measuring Wheel, 12 in Wheel, Feet;Inches no checkout Rugged and light weight die Rugged and light weight die cast aluminum head Vinyl cover for a comfortable and sure grip 3 way loading (14 ounce cartridge horn and battery function Low battery indicator—Smoke alarm will chirp in the event of a low battery Red LED—Flashes every 30 40 seconds to indicate that the smoke alarm is receiving power Dust cover Battery operated—Easy installation and continuous protection even during power outages Bolstered folding joint allows for compact storage and longer product life Designed to open under direct stress instead of breaking Over mold pistol grip handle for increased user comfort Heavy duty counter reset