Power packs for chairs are designed to be attachable to any wheelchair without too much effort. For a manual wheelchair, a power pack can convert the chair into a power wheelchair without having to buy another chair. The device can be easily installed to the bottom of any chair seat and requires very little effort to install.
The primary reason for buying a power pack is if you are having trouble pushing the wheelchair or propelling by yourself. It also comes in handy if you have a caretaker and they are also having issues with pushing the weight of the chair. If you buy one of these, you eliminate the need to exert so much energy to push a chair up a hill, or a ramp, or even uneven surfaces for that matter. All you have to do is push on a mechanism that makes the power pack engage in movement.