Propbably not a good idea to advertise it as having PS1 and DC emulators, the guy might buy one and then realise it doesn't actually emulate them adequately or worse still none of the games actually run.
To the OP if you want to emulate up to those levels you'll need a decent Android console, I have a GPD G5A and it's only $108, it emulates all those systems you mentioned and more.