Overmold handle for added comfort. Dual voltage works with both Ridgid 3.0Ah 24V Lithium Ion and 2.5Ah 18V Nicad batteries. Dual capacity tube holder holds both 10oz and 30oz tubes. Auto pressure relief automatically relieves pressure when switch is released. Adjustable speed control. Variable speed switch allows variable speeds within an adjustment range. Manual plunger release releases plunger rod for reloading tubes. Heavy duty joist follower aids in adhesive application to studs and joists. Conveniently attached piercing tool. Convenient lock-off button prevents accidental actuation of plunger.