ROCKBROS Q2S Rear Bike Light with Smart Brake Sensing and USB-C Cable - Black

Cyclists navigating busy city streets after dark need reliable visibility that reacts instantly to their movements. The ROCKBROS Q2S rear light mounts securely to your seatpost and delivers 60 lumens of bright LED output, while its intelligent brake sensor automatically increases brightness when you slow down—alerting drivers and riders behind you. The included USB-C to USB-A cable makes recharging the 400 mAh battery simple, and with up to 30 hours of runtime, you won't be left in the dark on long rides.

Key specifications

• Light source: LED, 60 lumens
• Battery: Rechargeable lithium-ion, 400 mAh
• Charging: USB-C port, cable included (USB-C to USB-A)
• Runtime: Up to 30 hours depending on mode
• Water resistance: IPX6
• Smart features: Brake sensing, auto on/off, motion sensor, light sensor
• Mounting: Seatpost strap mount
• Material: Aluminum alloy + PC
• Beam angle: 180°
• Light modes: Steady, flash, breathing
• Color: Black
• Included accessories: USB-C to USB-A charging cable, mounting strap
• Input: 5V, 0.5A
• Low battery indicator

Why choose it

The Q2S stands out with its intelligent brake sensing—when you decelerate, the light glows brighter like a car's brake light, giving following traffic extra reaction time. Its motion and light sensors turn the light on and off automatically, so you never forget to activate it. The IPX6 rating means it shrugs off heavy rain, and the aluminum alloy body withstands daily abuse. With multiple modes and a wide 180° beam, you're visible from all rear angles.

Ideal use cases

• Urban commuting in traffic
• Road cycling at dawn or dusk
• Night training rides
• E-bike or scooter rear safety light

Good to know

Charging takes about 2 hours via any standard USB-A port. The low battery indicator warns you before it dies. The strap mount fits most round and aero seatposts. For best results, angle the light slightly downward to avoid dazzling drivers.