This cordless inflator earned The Best rating from the Hammacher Schlemmer Institute because it automatically inflated tires faster than other models. With a 19" threaded hose that ensures a proper seal with tire valves, it inflated a mountain bike’s tire from fully deflated to 35 psi in 90 seconds, a car’s tire from 28 psi to 38 psi in 2 1/2 minutes and a high-pressure tire from 58 psi to 68 psi in 3:02 minutes. Other inflators took 98 seconds, 3 minutes, or 3:30 to inflate the same tires, respectively. It automatically shuts off when it reaches a desired tire pressure, which is set using its digital pressure gauge; a squeeze and release of the locking trigger begins inflation. Battery provides up to 20 minutes of continuous operation from a 2 1/2-hour charge using the included AC adapter. Can also be powered directly (but not recharged) by included 11'-long DC cable. Integrated LED illuminates tire valves. Includes ball needle and air mattress/balloon adapters. 5 1/2" L x 3" W x 10" H. (2 1/2 lbs.)