This device combines a 7-color e-paper display with an ESP32 microcontroller and GPS Receiver to display a map of the current location. The e-paper display is very well readable in bright sunlight and therefore ideal for outside use during the day. The energy efficiency of e-paper displays cause this device to last for several days on just one battery charge.
This device appears to be aimed at hiking and biking navigation due to it's presumably low power, However I haven't seen anywhere that it includes a compass sensor. This is almost essential as GPS alone at low speed or stopped will not always show the direction you are facing. This can be frustrating when choosing between footpaths in a forest, with no visible indicators.