We all have a different perception of low, mid and high frequencies. One might hear the highs better, while others might hear more of the low tones. This means that many people miss out on their music. The Audiodo technology analyses the hearing in your left and right ear and automatically optimises sound to your unique hearing. It reveals sound that you never knew you were missing! Please note: the Fresh ’n Rebel – Personal Sound app is only suitable for the Clam Elite headphones and Twins Elite earbuds. How does it work? 1. Download the Fresh ‘n Rebel - Personal Sound app; 2. Connect your Clam Elite or Twins Elite to the app 3. Take the 3-minute hearing calibration test; 4. Experience sound quality that is optimised to your individual and unique sense of hearing with your Personal Sound profile; 5. Use the intuitive equalizer to perfect the sound to your liking.