Featuring gear memory, brake highlight, and intelligent sensing functions for safe travels in the city. Equipped with two bases for easy installation. Stand out with colorful glare on busy streets. Product name: rear bike light. Product material: aluminum alloy + PC. Waterproof IP×4 levels. Light size: about 4.3x2.2cm/1.69x0.87 inches. Packing List: 1x Light, 1x Arch Bracket, 1x Seat Pole Bracket, 1x Data Cable, 1x Cable Tie. Note: Due to the different display and lighting effects, the actual color of the product may be slightly different from the color shown in the picture. Thanks! Due to manual measurement, a measurement deviation of 1-2cm is allowed. Seamless Working & Effortless Recall: Featuring gear memory function, effortlessly resumes from last setting with dazzling model of 61 COB beads or the O-light single color model showcasing 49 COB beads; no adjustments needed upon reuse. Sturdy Construction: Featuring cutting-edge optically designed curved surfaces and a highly transparent corrugated lens, this advanced rear bike light combines an aluminum alloy and PC shell for enhanced durability, waterproofing, and lightweight design. Good for Night Riding: Traveling through busy city streets or high mountains and long roads, this rear bike light ensures enhanced visibility and adds a protective layer for a secure journeys ahead. Easy Installation: With its double installation options, this rear bike light provides a range of eye-catching modes for improved visibility. Easily install on the saddle or seat pole for enhanced safety and compatibility with diverse bike models. Aesthetic Innovation: Stand out with this rear bike light's dazzling display. The green indicator flashes during charging, while the dynamic blue light adds flair: ensuring safety by turning off once charging is complete.