You can choose a wired or a wireless system based on your needs. Both have their benefits. Many of the units will accommodate between four and eight headsets, and they can work with a number of different types of headsets. They tend to have belt packs with them that will connect the headset. Since production can be rather rigorous, you will find that many of the options are very rugged and durable to accommodate for rough conditions. They usually have simply to use controls for things such as volume as well.