The nose pad of BonSayOn S102 bone conduction Bluetooth sunglasses is “bone conduction microphone”. We utilize the characteristic of anti-background noise of bone conduction microphone in order to improve the defect parts of using traditional air-conduction microphone. You can use Bluetooth transmission function for calling or answering the phone, and also listening to the music. We use retractable earphone, which has 4 stages length. It can be return by pulling the earphone to the end for auto-retrieving when you finish using the S102.