Redcaps can only really be used for eggs, which is a good thing as they are excellent layers. They can't really be used for meat as they're considered an endangered breed, and they hate confinement so much that they are incredibly difficult to show. Therefore, eggs are what they are best used for and eggs are what they do best.
As mentioned, Redcaps hate to be confined. They need plenty of open space to wander and forage, otherwise they can become very restless. They are more on the shy side, preferring to just keep to themselves rather than running over to humans whenever one comes near.
Redcaps look very similar to their cousins the Hamburgs, but they have larger red combs and ear-lobes. They have only one variety of plumage, appearing with dark reds, browns, and blacks with a black tail and commonly a black crescent shape on the side of the body.
Redcaps need to be kept out in the open as much as possible since they don't like being confined in any way. They need large runs to give them room to breathe. Because they're nearing extinction, breeding them is critical to keep them going, so if you plan on keeping them populating, you'll need to continue to breed them yourself.