This Marshall PTZ IP camera controller is a great choice for video surveillance, but please note it doesn't come with a power supply. There's a minor issue: the knob cover for Zoom Speed is missing, yet the knob still works perfectly fine.

Using this Marshall PTZ IP camera controller is quite straightforward. First, you need to connect it to your camera system (you'll have to provide your own power supply). You can then use the knobs to control the camera's movement and zoom speed. Even though the Zoom Speed knob cover is missing, it won't affect the normal use of the knob. When it comes to maintenance, keep it in a dry and clean place. If it gets dirty, you can use a soft cloth to gently wipe it. Avoid exposing it to extreme temperatures or humidity to ensure its long - term performance.