Petralex is a hearing aid application based on your Android phone or tablet device, running same principles as conventional wearable hearing aid. Auto-adjusting to your personalized hearing profile, completely invisible to anyone - use it with regular headset. Using powerful hardware running Android 4. 1 or higher with our patented algorithms and user-friendly interface with fast profile selection brings maximum sound quality and comfort of use. Benefits of Petralex: Easy to use - no special devices, no battery replacements or all-day wearing annoyance; - Quick Setup for any sound environment;- Increased sampling rate - 44. 1 kHz, providing the best sound quality; - Easy switching between device and headset microphones;- Full acoustic gain up to 30 dB with a standard headset;- Minimum signal processing delay - just 6, 3-15, 7 ms (depending on the model and software running simultaneously) ; - Use the built-in mic to catch sound from distant sources, i. e. in classroom, at theatre (or use it as a spy-ear. ) ;- Easy profile sync for all of your Android powered devices with Dropbox cloud storage support;- Setup and adjust the app without visiting a specialist;- BT headset support (for processed sound playback only, sound is captured by device onboard mic). You can compare the original and processed sound test phrases on our site www.petralex. pro. Petralex Hearing Aid is absolutely free to use because of your support. If you find the app useful, please support developers with donation at www.petralex. pro/donate. Disclaimer: The Petralex app is not approved as a medical device or software and cannot be used as a hearing aid with doctor`s prescription. Audiometric test provided in the application can be used only for app adjustment. Testing results are not a substitute for professional audiology tests and cannot be considered as a basis for diagnosis. Keep in touch: https://www.facebook.com/Petralex. EN https://twitter.com/PetralexEN.