This is a semi-portable gas generator. Advertised for car tires, I mainly wanted to use it for pneumatic and bicycle tires. It works great - inflates a completely flat bike tire in 4-5 seconds. Not loud at all. The only drawback is the power supply. It only uses your vehicle's 12V socket. You can't use it in a regular outlet (and don't use it with a converter unless you're sure the converter will give you at least 30A). It's a little hard, but not that bad for everyone. The outer shell is made of metal, and there is also a bright light at the end. To use a coiled hose, insert its end into the fixed connector on the machine and lower the latch. In general it works well, but the downside is that it can only be used in one car.