Features: Made of high elastic waterproof silicone material, stable and durable, strong tensile tension. High elastic silicone, multiple fixing methods - can be installed on handlebars, seatposts, forks, backpacks and more.Lights with white LEDs can be attached to the front of the helmet - can be used as a headlight and car light for night riding. The light with red LED can be fixed behind the helmet - it can be used as a tail light.3 switching modes: fast flashing, slow flashing, and always on. It can be switched quickly according to your actual needs. It is suitable for emergency lighting, outdoor play at night, mountaineering lighting, bicycle lighting. It can last up to 35 hours in full brightness mode. It can last up to 160 hours in flash mode. Effective visibility is higher than 600 meters.Quick release design - installation or removal can be done without any tools. Specifications: Appearance Color: blue body with blue light, product size: 40x30x30mm/1.57x1.18x1.18"Product net weight: 30g/pc Power supply: CR2032 button battery Packing list: 5 x lightsNote: 1. There may be slight dimensional deviation due to manual measurement, measurement methods and tools2. Due to different shooting light, angle and monitor, the picture may not reflect the actual color of the item.