Sound ID Sound ID 510 Universal Bluetooth Headset Features - EarPrint App - Personalize your sound preferences and settings with the first ever iPhone App for Bluetooth headsets Touch Sensor Volume - No more fumbling around to adjust the volume you're in control with just a touch of your finger on the headset 3X NoiseNavigation - 3 sensitive microphones eliminate wind and background noise from both ends of your call RealComfort EarLoops - Anatomically engineered for all-day comfort and conveniently stays in place even during rigorous activity