Smart Bicycle Cycling Bluetooth Helmet

Smart Bike Helmet，it is a Multi-fonction bike helmet: Bluetooth bone conduction headphones with mic can hands-free phone call,play music; Built-in wind protection goggle.conduction bluetooth headphones conduct sound to the cochlea through heekbones by vibration. Listen to your music or make phone calls and your surroundings simultaneously . specifications:  Type: Integrally-molded Helmet Material: PVC SIZE: M/L M: 54-58cm L: 58-62cm