Very easy to attach to the tire valve. The pressure gauge is difficult to use and does not give the correct pressure when it finally starts showing numbers. I used my old pressure gauge that I've had for about 50 years. I could only bleed one tire at a time, after which the battery had to be recharged. The tire weighed 28 pounds. Print. After airing up to 32 lbs. The battery didn't crank the engine a single revolution. I'm hoping to inflate all 4 tires to the correct pressure in the next 8 hours. Spend your money on something better than these things. It will be cheaper and easier to just pay a few bucks at the gas station and damn quicker.