DS9 Defense Sphere

On a recent DS9 rewatch I realized that we never actually see Earth's orbital defenses, so I made this: the Defense Sphere. They have a crew of 10, impulse engines but no warp drive, and two phaser strips. They are designed to be simple to build and deployed in large numbers. They would also be built with some automatic redundancy so that they could be optionally crewed, one Sphere could take control of other's in the defense network, with some performance loss over one with a crew inside it.