Power cord length
The length of the cord with which the compressor is connected to a power source — a standard car socket DC 12V (so-called cigarette lighter) or directly to the battery terminals. It is believed that the length of the cable should not be less than two metres to avoid inconvenience in operation.
Hose length
The length of the hose through which air is pumped into the tyre. The larger it is, the more convenient the device is to use. But it is rare that the compressor is left far from the wheel, especially if a pressure gauge is placed on the device, which must be periodically checked. For domestic use in cars, a one and a half metre long hose is enough. Powerful and performant models can be equipped with a hose of 7 metres or more, but these are more solutions for commercial use in car services.
Air bleeding
The presence of the function of
bleeding air in the design of the device.
This function is found exclusively in electric compressors (see "Type"). It, in fact, allows you to run the compressor "in the opposite direction" — not for pumping, but for drawing air. This mode can be useful if you need to quickly deflate a large inflatable object — for example, a mattress: manually blowing off often turns out to be a rather long and tedious task, and besides, it is not always possible to effectively remove residual air, while the compressor handles with this without problems.
Usually, for work with bleeding, a special hole is provided on the body, to which the air hose must be rearranged.
