Handle the USB-SD-Mux carefully, as it may have sharp edges.
Use the USB-SD-Mux in a clean and ESD protected work environment.
Don't let the USB-SD-Mux get in contact with water or coffee.
Make sure, that the USB-SD-Mux does not damage your embedded device. The USB-SD-Mux might interfere with your device, since most embedded devices have not been designed to use one.