nkomax Smart Bike Tail Light — USB Rechargeable Rear Light, IPX6 Waterproof Aluminum, Auto On/Off & Brake Boost (400mAh)

nkomax Smart Bike Tail Light is a compact, USB-rechargeable rear light with an intelligent auto on/off sensor, brake-mode boost, and IPX6 waterproof aluminum body for reliable night visibility.

Designed to make you more visible without adding bulk, this rear bicycle light combines a high-intensity COB LED, a durable 6061 aluminum chassis and smart sensors that respond to ambient light and motion. It mounts to most saddle rails with a quick-fit strap, weighs only 38 g and provides long runtimes from its 400 mAh lithium-ion battery. Whether you commute, train or ride for leisure, it’s built to stay bright in rain, fog and low-light conditions.

How does the automatic on/off and brake detection work?

The light uses an integrated sensor that senses ambient brightness and movement. It will automatically power on when you enter low-light conditions and switch off in bright daylight to save battery. When decelerating, the unit detects the change in motion and instantly switches to a brighter brake mode to alert following traffic.

• Auto start/stop based on light intensity
• Brake-mode activation on deceleration
• Manual mode available when you prefer direct control

What kind of brightness, beam and visibility can I expect?

The COB LED plus a high-brightness comb lens spreads light across a wide 180° field so you’re visible from multiple angles. The lens design minimizes glare while maintaining a clear, strong output that’s claimed to be noticeable up to around 150 meters under typical night conditions. Several output modes let you choose steady or flashing patterns for different riding situations.

• COB LED for even, intense illumination
• 180° viewing angle for side and rear visibility
• Multiple steady and flashing modes to suit traffic and road types

How long will the battery last and how do I recharge it?

The internal 400 mAh rechargeable lithium-ion battery delivers over 20 hours of runtime depending on mode and brightness. Recharging is done with the supplied USB cable from a computer, power bank or USB wall adapter. The light also features a sleep mode that reduces power draw when the bike is stationary for extended periods.

• 400 mAh Li-ion battery, USB-rechargeable
• 20+ hours runtime on lower settings; varies by mode
• Auto-sleep to conserve charge when not moving

Is the light durable and easy to mount on my bike?

The chassis is machined from 6061 aluminum for a lightweight yet robust shell that sheds heat and resists impact. Rated IPX6, it withstands heavy rain and sprays without water ingress. Mounting is tool-free using a flexible saddle-rail strap that adapts to most road and commuter bike rails.

• 6061 aluminum body for durability and heat dissipation
• IPX6 water- and dust-resistance for rainy rides
• Quick-release strap fits most saddle rails and seatposts

Who is this for: The nkomax Smart Bike Tail Light suits commuters, road cyclists and leisure riders who want a compact, dependable rear light that automatically reacts to changing light and motion. It’s especially useful for riders who prefer hands-free operation and a corrosion-resistant metal housing, yet still want the option of manual control or different flash modes for busy traffic or group rides.