Soundid SM100 Bluetooth Headset Dual Microphone with Noise Reduction Personalized Sound - With the SM100, a user can personalize the headset to address his or her specific sound preferences - resulting in crisp, clear audio across mobile communications settings. EnvironmentalMode - When a user is not on a cell phone call, the SM100 amplifies the environment to allow both ears to work together and eliminate the occluded effect associated with traditional headsets - improving everyday in-person communication NoiseNavigation System - Sound ID's Auto Focus for your Ears, determines the loudness frequency, pitch and tempo of incoming sound so the SM100 can initiate counter measures - reducing wind and background noise while improving speech understanding and sound quality