Nintendo’s new wireless NES controllers are a Switch Online exclusive
https://www.techradar.com/news/nintendos-new-wireless-nes-controllers-are-a-switch-online-exclusive
Announced during the latest Nintendo Direct on September 13, gamers will soon be able to purchase a pair of wireless NES controllers for the Nintendo Switch, allowing them to revisit the company's classic 8-bit titles as they were meant to be played.
Much like the Switch's Joy-Con controllers, the wireless NES pads can be recharged by simply slotting them into the sides of your Switch console.