The ROCKBROS Q2S Samurai is a rear bicycle tail light designed to keep you visible and safe during your rides. It utilizes a high-intensity COB LED to provide clear signaling, offering four distinct lighting modes including steady on, breathing, and both slow and fast flashing options to suit different visibility needs. Safety is enhanced by a smart brake sensing feature that automatically increases the light's brightness when you decelerate, alerting drivers behind you. To preserve the 3.7V 260mAh lithium battery, the device includes an auto on/off function that shuts the light down after 30 seconds of inactivity in specific modes. Depending on your chosen setting, you can expect a battery life ranging from 7 to 16 hours, with a full recharge taking about 2 hours via the USB-C port. Constructed from a blend of ABS, PC, and aluminum alloy, this lightweight accessory weighs only 23 g and carries an IPX6 waterproof rating, meaning it will continue to function reliably in heavy rain. It comes with mounting brackets for both the saddle rail and seatpost, making it a versatile choice for road bikes, mountain bikes, electric scooters, or urban commuters. Integrated indicators keep you informed about the charging status and when the battery is running low.