Sontro Self-Fitting OTC Hearing Aids, Pair, Grey Sontro Self-Fitting OTC Hearing Aids - FDA Cleared, using self-fitting technology, hearing aids are easily programmed to each ear's unique hearing loss in 3 minutes, using an AI-powered in-app hearing test, ensuring a proper fit. Includes one carrying case, four 312 batteries, multiple hearing aid domes, a ric measurement tool, a cleaning tool, and sport locks. Note: Model AI does not stream. Personalized Self-Fit - Uniquely, the patented otoTune app (free) tests both ears simultaneously when paired with the Sontro OTC Self-Fitting Hearing Aids, delivering clinically validated test results. Risk-Free, 45-Day, Money-Back Guarantee - Soundwave Hearing provides a one-year warranty, free shipping, and lifetime customer support. Operating systems required: Android OS 6.0+ or iPhone iOS 11.0+ and the free otoTune app.