The ROCKBROS Q5 Smart Bike Tail Light with Brake Sensor is a compact, high-visibility rear light designed for road and mountain cyclists who want smarter safety on night rides. With brake sensing, auto wake/sleep, and rugged weather protection, it keeps you seen and confident in any condition.

• Smart Brake Sensing: High-lumen COB LEDs instantly boost to maximum brightness when braking to alert nearby vehicles and riders, enhancing road safety.
• Auto Wake-Up & Sleep: Vibration triggers wake-up and the light auto-turns off after 30 seconds of inactivity; an ambient light sensor adjusts brightness for optimal visibility and power efficiency.
• Four Lighting Modes: Choose Normal Flash, Breathing Flash, Fast Flash, or Steady On to suit day or night riding conditions across road, mountain, and commuter bikes.
• Long Battery Life with Power Display: A 400mAh rechargeable Li-ion battery delivers up to 50 hours of runtime, with four LED indicators showing battery status in 25% increments.
• Dual Mounting Options: Securely attach via Under-Saddle Rail Mount or Seatpost Mount for a versatile, tool-free installation on most bikes.
• Durable, Weather-Ready Construction: CNC aluminum alloy shell with IPX6 waterproof rating withstands rain and splashes for reliable performance.
• Compact, Lightweight Design: Weighing approximately 55 g and sized at about 40×34×34 mm, it stays unobtrusive while delivering strong rear visibility.
• Type-C Fast Charging: Quick and convenient charging keeps downtime to a minimum, so you can get back on the road sooner.

The Q5 is ideal for riders who value proactive safety, energy efficiency, and flexible installation. Its brake-sensing brightness, smart auto-adjustments, and weather-ready build make it a dependable companion for both night gravel sessions and city commutes. With up to 50 hours of runtime and a reliable dual-mount system, you can switch between bikes effortlessly while maintaining clear, high-visibility rear signaling in any condition.