Designed to house a round 7cm QI charger and fit a Samsung Galaxy S7 both vertical and horizontal even with a protector. Distance between the upper prongs are 74mm so it should work with any phone longer and/or slimmer than that. The stand also works if you prefer charge your phone by plugging it in.
I bought my QI pad from ebay, its not sold anymore but it looks like this one https://www.banggood.com/Q5-Wireless-Charger-Pad-Qi-Standard-Transmitter-White-Chassis-For-Phone-p-974659.html
The MainOP is the one im using is made to be a snug fit with the OnePlus microUSB cable. I made the MainL with a larger hole that should have a better chance to fit other cables.
QiRing is there to hold the QI charger in place.