B4 in-ear Bluetooth headset wireless neck-mounted sports running neck-mounted headset black

Life-grade waterproof and all-round protection, even if you sweat profusely, there will be no harm to the earphones. It is resistant to stains and corrosion for a long time and durable, and you are not afraid of sweat and rain., 45° inclined in-ear ergonomic design, the golden ratio is superimposed three times, it is firmly worn and comfortable in the ear, and it is a kind of enjoyment to wear., The speaker and the central control magnetic suction design are not entangled for easy storage, and it is light and stylish to wear and is not easy to lose., The neck hanging is preferably made of medical liquid silicone material, which is elastic and smooth like skin, warm and comfortable, and can be bent at will.