May just require a new battery or perhaps a charger. This device has sat unused for a few years.
The heart of the unit is an HP ipaq hx 2490c, using the same battery and charger. The item "Solmetric SunEye 110S v2 with Charger, CD and Manual Does Not Power On" is in sale since Saturday, April 18, 2020. This item is in the category "Business & Industrial\Fuel & Energy\Alternative Fuel & Energy\Solar Power". The seller is "steveg98" and is located in Bernville, Pennsylvania.
This item can be shipped worldwide.