Nintendo provided some color coding to remind us that these seemingly identical Joy-Cons actually house different hardware.

With different contents come different model numbers: The neon blue controller is designated HAC-015, while the neon red is HAC-016.

Neon not your thing? If you're good at stickers, you can mask their true colors with a skin.

... or a laptop, wireless headset, wireless printer, microwave, wireless speakers, smart watch, cordless phone—basically, this is best used in a cave.