Blind spot Camara

Hi, I’m after recommendations for a blind spot Camara.
Nothing elaborate, I just need to see what is alongside me.
I had one purchased from Ebay and it was Bob really, having said that, as poor as if was, before if failed,I got used to it and now I find myself missing that reassurance.
Wireless would be best, but that may have been part of the reason it was not the best picture.
Thanks