This Bluetooth Control Module is specially designed for Crane M3, it has to be used with the expansion base to control your camera and adjust ISO, aperture, shutter speed. Please note that only compatible cameras can be used with this module.
Click to check detailed compatibility list: click here
If you have more than one cameras with different ports, you need buy different control modules. For example, you have one Sony A73, and one Nikon Z6, to make use of this control module, you will need buy a multi port for Sony A73, and a type-c port for Nikon Z6.
Transmount Bluetooth Control Module for Crane M3