I use one that was bundled with my Q50PRO. I believe it's this camera here:
https://www.amazon.com/Backup-Waterproof-Rearview-Compatible-Stereos/dp/B0BBZLBVD4/ref=sr\_1\_3?crid=SVIHIFS6ECFG&keywords=eonon+backup+camera&qid=1686053403&sprefix=eonon+backup+camer%2Caps%2C89&sr=8-3