Please note that the EarPrint application does not work with other manufactured Bluetooth headsets or earlier models of Sound ID headsets.This includes models 200, 300, 400, 500 or the 512.nn EarPrint 3 app, with the swirl of a finger, has the ability to personalize the audio characteristics of the Sound ID headsets in all 3 audio modes ...phone, musicmedia and Pass Thru. The PersonalSound feature is designed because "everyone hears differently" and has their own unique EarPrint. The goal of Personal Sound is to maximize speech understanding and clarity while keeping the listener in a comfortable listening range. nnThe tools include a selectable InCall LED Status indicator, "Find My Headset" feature to locate your lost headset, 3 Microphone Noise Canceller Demonstration so you can hear the difference, and Pass Thru Mode which amplifies when you're not on a call so you hear equally with both ears. nThe Battery Status will show you the remaining battery level and a Sound Level Meter feature displays the sound level at your ear. And this is only the beginning..... nnThis version of EarPrint supports Voice Menu customization.This feature only works with the Sound ID SIX headset.All 510 headset users will not be able to access this feature.A new software and firmware release is coming soon to allow all EarPrint features to work with both the SIX and 510.