E-ink holds its image with no power at all. The display only draws current when it redraws, so the board runs for over a day on a 2000mAh battery.

A button on the top cycles through three views. The weather view pulls a three day forecast, sunrise + sunset times, and the current moon phase. The message view lists what has come in over the mesh. The node view shows every radio the board has heard, sorted by signal strength.