【RGB LED Display Screen】 Equipped with a vibrant RGB LED display screen (12x48 pixels), offering dynamic lighting effects for enhanced visibility and style while riding at night. 【IPX4 Waterproof Rating】 Built to withstand light rain and splashes, the helmet's IPX4 waterproof rating ensures it performs well in various weather conditions. 【Long Battery Life】 Powered by a 1500mAh polymer battery, providing up to 12 hours of usage on a full charge (charging time: 4 hours). 【Premium Protection & Comfort】 Made with a durable PC outer shell and an EPS cushioning layer, offering superior impact resistance and comfort for long rides. 【USB Type-C Charging】 Features a convenient Type-C charging port (5V/2A), ensuring fast and efficient charging for your helmet. Specifications: Head Circumference: 58-61cm Battery Model: 803450 Polymer Battery Capacity: 1500mAh LED Type: 2121 RGB LED Material: PC Shell + EPS Cushioning Layer Charging Time: 4 hours Usage Time: 12 hours Pixel Size: 12x48 LED Quantity: 576 LEDs Product Weight: 368g