I have a manual hand pump i have strapped to the side of my bike and its such a pain to use when i need alot of air in teh tire from sitting a season or from a long ride that i wanted something more. I came across this little compact compresser set for car tires with a cig plug to power it. It came with 2 pins for pool toys and blow up pin for balls. The main nozzle is a screw on so you dont have to stand there all day waiting for it to fill a car tire or in my case this was for my bike. Today i gave it a test run and within seconds i had my 45 psi from 20psi. Its not that loud and works off my cig lighter aux 12 vold battery unit which is a perk. Its small enough to keep in your bag for an emergancy pack in your car. not so good for on trails but that i can use the hand pump for:). all in all i am very pleased with this unit and i hope it lasts a long life as ill be needing this for 8 bikes. If anythign changes i will update this post till than have a rgeat day.