Currently cost of hearing aids and batteries has often been beyond the reach of the poor. Solar is a solar-powered hearing aid battery that costs very less than the traditional batteries cost and it last for 2-3 years whereas normal battery charge last for one week. Batteries are recharged with solar power, avoiding to be discarded on the environment.
All the hearing aids are manufactured by deaf people and the company offers complete hearing aids at greatly reduced prices
For more details refer Solar Ear website at: http://solarear.com.br/