Sell Youpin Smart 4U Helmet Upgraded SH50 Blke Bicycle Smart Helmet Light Sensing Braking Warning Led best price

Safety: one-molding process, the United States imported PC and EPS material, making the helmet more secure - Intelligent lighting: 7 high-brightness LED back lights automatically light or standby according to the intensity of light, and the visible distance is over 180 meters - One button to control three lighting modes: shortly press the switch button to switch the light mode after booting: tide mode (light sense), flash mode (light sense), strobe mode (normally on) - Brake warning light and automatic shutdown: when braking, the taillights are fully illuminated for about 2 seconds; and the lights automatically shut down when removed for about 20 minutes - Good ventilation effect: according to the aerodynamic principle, wind holes for ventilation and comfort - Long battery life: charging once, battery life can last for 36 hours, standby for 180 hours - A wide range of applications: electric bicycles, electric scooters, balance vehicles, roller skating, bicycles, etc. Head measurement (CM): 54-58 (size M) ; 57-61 (size L) Product size (CM): 27.5 * 21.4 * 15.9 (size M) 28.2 * 22.4 * 16.0 (size L) Battery: 3.7V 455mAh Working time: 36 hours Standard time: 180 days Charging time: 3 hours There is no xiaomi logo on it .since this is xiaomi eco-logical product