If the screen is black but the camera is powered, you may need to activate the camera in the head unit's "Factory Settings" (often accessed by a password like 000000 or 123456 ).
But is the hype real? Here is an informative breakdown of why the ZXDJ 01 is frequently cited as the "best" in its class, along with what you need to know before buying. zxdz 01 reverse camera best