Although the shapes and colors differ, all have the same function. Compatible with analog/AHD/TVI/CVI cameras from various manufacturers. This is an all-in-one type that protects both the power and video of the camera. Reduces the risk of damage to security cameras due to high voltage from induced lightning, etc. Operation has been confirmed. It has never been used in the field, only connected once for testing. Grounding is Class D. No pets or smoking, so there is no odor. Power-over-coax cameras cannot be used.