??Automatic Light Sensation LED Lighting?Bright but not Dazzling As equipped a 7-key high brightness LED lighting group, with automatic light sensation function, this bling helmet is capable of automatic starting up or standby according to the intensity of the ambient light. By adoptingprecise mirror polishing process, the lighting strip reaches a 180-meter visual distance, a sweet safe companion in the late night. ??Waterproof Design All-weather Suitable?The helmet employs an lPX4 waterproof design for allowing short exposure to the rain. For your safety, please do not exposeto the rain for a long time while wearingit. Waterproof Testing Report No: AGC03815180503CR01 ??Size?This cycle helmet allows adjust the head via the dial in the back and adjustable straps, they enable you to wear the helmet in the correct position for a feeling of reassuring comfort. Head Size: L: 22.44-24.02in(57-61cm). ?No Mic and Speaker.? ??Integral Molding for Better Protection?The exterior shell ofthe helmetemploys PC (polycarbonate) materialwhile the interior uses imported PSI-205T high density EPS (polystyrene foam). With an integral molding of external and internal layers, it dramatically strengthens the helmet impact resistance for safer daily joumeys on the road. ??Built-in 12 Vents for Excellent Ventilation?Themorevents ofthe helmet, the betterventilation andfaster coolingwhile theprotection body of the helmet, to the contrast, is lessened. On the premise of safety and good ventilations, we introduced the aerodynamics design concept and verified 12vents as the optimal solution.