ECE / DOT certificationProduct features:1. This helmet is approved by ECE and DOT.2. Multifunctional Long-lasting battery life, stereo playback.3. Double Visor:The inner visor is a sunglasses visor, and the outer visor is an anti-fog visor.4. The detachable inner lining can be washed with water, deodorizing and odorless.5. High polymer carbon fiber material, impact resistance.6. According to the principle of aerodynamics, it has good ventilation and can comfortably hold the head at all times.Product details:Type: flip-up helmet with double lensMaterial: engineering plasticWeight: approx. 1500 gramsSize: 57-64cmSize reference: M (57 ~ 58 cm), L (59 ~ 60 cm), XL (61 ~ 62 cm),XXL (63 ~ 64 cm)Package list:1x Helmets MotorcycleKIND REMIND1. Measured by hand, please accept 1-2cm deviation. 2. Please fully charge it before first use and charge it once a month regularly if you're not using it for a long time.NOTEAdapter is NOT included (it can be charged by any phone adapter)