BonSayOn W201is a Goggle style. It has the same function of what BonSayOn design for Bluetooth and bone conduction microphone. It also can be used for “ski goggle” or “wind goggle” or “eye protection goggle”. The nose pad of BonSayOn W201 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. The earphone is external plug-in design.