Earrck Ear Amplifier Hearing aids provide you with an affordable high-quality personal sound amplification solution. You can finally hear the sound of the TV, conversation, and outdoor activities while on the phone, instead of spending thousands of dollars on the prescribed hearing aids.Digital Hearing amplifiers are the Perfect gifts for the seniors to bring them back to the clear world. So they never miss conversations with friends and family. Let them hear the colorful sounds again and fill the family with love and laughter! The Earrck hearing aid is an affordable hearing solution paired with smart tech. The behind-the-ear hearing aids, for seniors and adults, were engineered for better hearing and comfort. We leverage smart, cutting-edge software technology to bring a great experience with high-quality hearing aids to our customers MAX-OSPL90 : ≤ 120dB HFA - SSPL90 : 105±4dB FOG50 (Peak Gain) : ≤ 45dB FHA AVG : ≤ 34±4dB Noise Level : ≤ 32dB Frequency Range : F1 ≤ 200Hz F2≥ 8000Hz Harmonic Distortion : ≤ 3% Step 1 : Download and install the APP " BSLLTER" Please download app and long press button 3S for turning on your hearinf aids. Hearing aids connect to APP Please Turn on the Bluetooth in your phone setting to allow the phone pair with the Dragon-L and Dragon-R . and then click "searching for devices", the last the HA-Fit APP will connect to the hearing aid, and the successful connection status is shown as image. Customizing your hearing with Hearing Test or Audiogram fitting in-ear fitting : Play a series of calibrated sounds through your device for more immersive fittings in less quiet environments. or Audiogram fitting : Based on your audiogram, one-click operation to quickly fit your hearing aids How to control Smart APP a) Please turn on the function of Noise Reduction and Whistle suppression for hearing clearly b) Adjust the volume, modes and Noise: 1. Press the button or app directly 2. Adjust volume: Short press the button on device or APP 3. Adjust modes: press 3S on the button on device to change programs or APP 4. (P1: quiet, P2: conversation, P3: outdoor P4 Watch TV) " BSLLTER" APP How to connect to APP Hearing test and Self-fitting Hearing Aid with Smart APP Control