A lot of come completely assembled, and all you need to do is plug the device right into a power source and turn it on. http://[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@www.sybr.eces.si.v.e.x.