🚴 Smart4u Smart Bike Helmet: Stay Safe with 3 Alert Light Variations, Bling Helmet Design, Comfortable Lightweight, Breathable & Waterproof Review

【Auto Break Lights】When the smart helmet built-in accelerometer sensor detects a significant deceleration, the lights will be automatically highlight for 2 seconds acting as brake lights warning traffic and pedestrians you are slowing down. 【3 Mode Lights】Through the buttons on the back of the helmet, one button to switch 3 lighting Mode - flashing light/fast flashing light/tidal light, it will warn cars and help other riders behind you clearly recognized your direction. Riding at night is safer and more reliable. 【All-round Breathable】The adoption of specialized aerodynamic and ventilation design, 12 ventilation holes help to dissipate heat and perspiration, bringing you comfort and coolness at all times. 【Upgrade Adjust System】The size adjustment system of adult helmet can adapt to different head sizes to meet the needs of different users. The simple and generous appearance and practical detail design make the bicycle helmet an ideal companion for every adventure. If you are a person who like cycling trip or other outdoor activities, this bike helmet set is the better choice to improve your comfortable and safety.