What Renewed Means for This Switch
A renewed Switch has had a previous life. Typically a customer bought it new and returned it or traded it in for a different model; Amazon-qualified suppliers then inspect and test it so that it works and looks like new, and it goes back on sale under Amazon Renewed. The practical safeguard is the Amazon Renewed Guarantee: if you are not satisfied, the console is eligible for a replacement or a refund. That makes the first days of ownership important. Try both docked and handheld play, attach and detach the Joy-Cons, charge the battery fully and check the screen and casing as soon as it arrives, so that any problem is dealt with while the guarantee is fresh in mind.