They have said they are made by someone else. They also said they tested dozens of them before deciding on which one to use. The prices on the ones like theirs is not usually that much less than buying the Hydros branded one. The hydros comes with a mounting bracket also. Also you get the firmware that has been tested with the Hydros when you buy the Hydros. I cannot see any reason to buy the others unless you need one in a hurray and it would be available in a pinch.Are they though? Has anyone opened them and dissected the parts? A lot of knockoffs do a great job at looking exactly like the “real thing” but use way cheaper components inside.