So the Tandem Mobi is a multi thousand dollar kit. The pump only wirelessly charges. It comes with a charging pad.
The charging pad has a USB-C port but it’s USB 2 at best and does not support PD power sources.
Multi thousand dollar device that comes with the cheapest wireless charging pad.
It’s not anything special either. It’s not marked Qi but it’s a Qi pad. My iPhone will charge from it and the Mobi will charge from my various wireless charging pads.
The charging is apparently so fiddly, also, that people sell 3D printed brackets to ensure the mobi sits on the pad correctly.
I feel like Tandem could have actually designed a good charging system here but it seems like they just went to Alibaba, found the cheapest pad, and had it branded for them.
Funny enough, the size and shape of the mobi is such that it fits pretty well on my various AirPods charging pads, and will charge from this.