The 31.2" has the possibility to connect to a solar panel.
Even with having a bigger active display, the visibility will not be affected by the environment. The display can be read under almost any environmental conditions since it has the same contrast and reflectivity as paper but as long as there is light. Reflected light will be used, making it easy on the eyes.
One unique feature of this model is, it provides detailed information to passengers such as giving different bus routes, traffic congestions, and disaster information in real-time.
It has a sensor box that collects data such as PM2.5 particulate conditions and flooding conditions. This feature is optional.
This model is perfect for urban areas.
To know more about this solution, you can visit this link https://www.disign-store.com/en/maas/