Godisa - Africa's only hearing aid manufacturer and the only one in the world making them specifically for the sub-Saharan Africa environment - has released the SolarAid.
It is a combination of hearing aid and a lightweight solar-charger that charges the two small batteries.
Batteries that don't need to be replaced and are free to recharge make the hearing aids affordable as well as environmentally-friendly. A fully-charged battery lasts for four to six days, which sounds good to me.
[Via AmericanInventorSpot]
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