What these satellites lack is a viable propulsion system.

Accion Systems has developed a commercial electrospray propulsion system — their first is about the size of a pack of gum — made of tiny chips that provide thrust for small satellites. Among other advantages, Accion's module can be manufactured for significantly less than today's alternatives.

This technology could enable low-cost satellites, such as those known as "CubeSats," to become more viable for various commercial and research applications, including advanced imaging and communications, where numerous satellites could provide global coverage.
 

Electric propulsion (EP) provides momentum for propelling spacecraft (in space, not for launch) by converting electrical energy into kinetic energy. Charged particles are electromagnetically accelerated within the propulsion device, and the opposite momentum reaction forces the spacecraft in the other direction. This is in contrast to chemical propulsion, which utilizes the exchange from chemical energy to kinetic.