I've used many blowers and the most common need is a power source - I need to plug in/turn on the car to inflate a bike tire, ball, etc. As we ride bikes more and more, it has become impractical to have access to a car to vent the bike. So I'm starting to look for one that can be portable - no need to plug it into a power source and small enough to carry around. That's when I came across cycplus. They have several models, originally I just wanted to buy for the bike and while researching I came across this model (A5). What's great about this device is that it's portable with a built-in battery that can inflate a bike (on the road) and comes with a cigarette lighter cable - for inflating car tires. In addition to the pumping function, it can be used as an emergency light and a fast power source to charge your phone. It doesn't have a large power supply, so I wouldn't use it as a power supply, but for emergencies. According to the instructions, with a fully charged device you can inflate 6-8 deflated bike tires or 1 deflated 17" tire. Although the device is small it is quite powerful, I was able to take my bike from 35psi to 50psi in less than 2 minutes And I was able to test 10psi on all 4 car tires with the same load, it only took a few minutes and the device still had power. A suggestion to the manufacturer - it would be nice to include a carrying case. The device is compact and portable, but you need to carry it in a big box and it is difficult to store it in a paper box, then it would be the prefect.