I also plan on using it with a Terasic DE10-Nano Kit with all the MiSTer project boards attached. I will eventually try this on the Raspberry Pi 4B but I have to buy one first. As expected, it connected instantly, worked flawlessly and stayed connected. UPDATE: I just tried it with a Raspberry Pi 3B running the Retropi Emulator. If it will work with an XU4 it should work perfectly with a Raspberry Pi. This one worked so well I am raising it to 5 stars. It's very hard to find a wireless game pad that will pair reliably to an XU4. To my amazement it was instantly recognized, worked perfectly, stayed connected, has low latency and has a good range. UPDATE 1/14/20: I finally tested this on one of my Odroid XU4 single board computers for retro game emulation last night. If it will connect reliably to an Odroid XU4 I will be very pleased. I need to test it with my Odroid XU4 SBC for retro game emulation. It's not actually uncomfortable to use but it could be better if all the edges were rounded. The size is a bit smaller than an Xbox One controller with a very similar button and stick configuration. I don't own a MAC so I can't comment on using it with one. It connects and stays connected to all my PCs, Android TV Boxes and Linux computers via the 2.4GHZ dongle.
Most all others that are in the sub $20 price bracket use AAA batteries. At the price I paid these are great game pads.
