My advice? Don't, if you can be guaranteed a working unit fine, other wise pass.
I've got 2 both have issues, one of them I got cheap from a pricing mistake the one I paid full price for I regret.
If you must buy one I would also recommend dino.
Just make sure you pay for return shipping insurance.
Willgoo has stiffed people lately.
I bought from fox offer and they are super slow to responded 'weeks' you have to send a email, wait, then send another email asking about the first to get a response.