You can't tell a Guitar Hero controller's console just by looks—most share the same guitar shape. Compatibility varies: the same model often works on multiple consoles (e.g., GH3 Les Paul on PS2 & Xbox 360).
How to Identify Compatibility
Original packaging: Lists compatible consoles.
Labels/markings: Check back, bottom, or battery compartment for console logos or model numbers.
Model number search: Google the model number (e.g., "96791" or "GHWT Guitar") + "compatibility".
Connection port: PS2 (round), Xbox 360 (proprietary wide USB), Wii (Wiimote slot), USB (PC/PS3). Adapters exist but vary.
Test it: Plug into the target console—if it works, it's compatible.