Nano Hearing Aids (888-310-NANO), a trusted US-based manufacturer of over-the-counter (OTC) hearing aids, has released a new buyer’s guide comparing zinc-air and rechargeable battery aids.

Nano Hearing Aids (888-310-NANO) has released their new First Ear Plus ITE over-the-counter (OTC) hearing aids, which offer users a comfortable fit and long battery life.