8Feedback-Free ListeningYour Yuu hearing devices have an optional start up delaythat can be activated by your hearing healthcareprofessional. If the start up delay is activated, yourhearing devices will not turn on for 10-15 seconds afteryou close the battery door. The hearing devices return tothe start up delay position each time you turn yourhearing devices on. This allows you to insert yourhearing devices without experiencing whistling.If you wear hearing devices now, you may haveexperienced whistling from your hearing devices whenyou talk, chew, use the telephone or hug someone. Yuu’sfeedback technology dramatically reduces thisuncomfortable whistling before you or anyone else canperceive it.