Nintendo Wii U
The Wii U was no Nintendo Switch, but it had a similar idea. Users didn't quite like it, though, due to the bulky design and the fact that you had to carry both the handheld controller and the base station... Wii U only sold 14 million units in comparison to the 100 million units of the Wii.
Google Glass
The Google Glass was... an idea. However, it was not executed well at all. Users looked like a Terminator-esque villain with these glasses on, and it wasn't subtle. The glasses used AR technology for use, and there was even a camera installed. Of course, this made the product a privacy issue since it could record anyone at any time without them knowing. Needless to say, the $1,500 glasses didn't take off and flopped.