What is the maximum length of the USB-microUSB cable?
There is no specific maximum. The longer the cable, the thicker gauge internal wires are necessary to prevent voltage drop. I can tell you that the 15’ cable from Monoprice linked below is adequate:
If you need a cable longer than that, you will have to try to determine if it is of sufficient gauge to prevent too much of a voltage drop. Use a voltage drop calculator such as this one:
I recently went thru the same max length exercise, cuz I wanted a longer USB cable RATHER THAN a bigger whole to cut (to get thru the big plug of an extension cord).
I beLIEve the total max length is 16.4 feet, UNLESS you get an “Active” USB cable. This product from Amazon… https://www.amazon.com/gp/product/B00KY9M51O/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 gave me the 21 or so total feet I needed. The camera works great.
The “active” part is about getting data transmission to work over longer distances. Not really relevant for just power transmission as being used for the Wyzecam. The info for the cable you link actually says “Not recommended for charging devices such as a smartphone”. I don’t see any spec listed for AWG wire gauge for the power wires, but if it’s working for your Wyzecam, it’s probably fine.
Assuming I understand what you’re talking about - I use a 25’ cable for one of my cameras. It’s working great: