For auto glass installers, roofers, building contractors, cabinet makers, carpet layers, and other caulking applications. Variable speed dial controls caulk flow. Rapid plunger release, caulking tube volume gauge, overload clutch, trigger control with lock-off switch, and hand strap to prevent tool from being dropped. Designed for standard 11-ounce caulking tubes. Expels up to 10 tubes of caulk with one fully charged battery.