Has brakes on both wheels, two speeds and to take care of the belt - you splash some water on it (never needs grease).
“...and a real chain.”
Why? They’re dirty, require frequent lubrication/cleaning, cause wear to the sprocket, and they’re noisy. Belt drive is a much better solution, IMHO.
The rest of the bike looks like a 5 year old designed it though. Much less bang for the buck than you’d get out of most $400 mountain bikes you can order online.