Bicycle Smart Auto Brake Sensing Light




The Smart Break Light comprises of 12-LED tail lights built for safety and visibility during the day or night! ???? ❌

Like a car, it detects when you are braking to emit a bright light alerting others you’re stopping. ✋ 



4 light modes for your choice: slow flash, breathing flicker, and steady on. Under the weak light circumstance, this light-sensing bike taillight brake sensor will automatically detect it and turn on for eye-catching back rider and car driver.



Click the button to select between our 5 modes and 3 Brightness Levels.



Support quickly charging, the rechargeable bike tail light can be power by a 2A cable. Built-in 400mAh Li-ion battery, the taillight lasting 50 hours running time in full charging of 20-30 minutes.

The bike smart brake light will be automatically switched off when detecting in no motion after 30 secs. Once touch it or detect the bike moving, the light will automatically turn on. It’s more convenient to use and saves your valuable time.




Designed to endure any and all terrains and climates. No need to worry about rainy days or puddles, Our smart light is 100% waterproof!



Compared with the old taillights, the new Q5 taillights use more technical quality lamp beads and lenses.
Make the light soft, not hurt the eyes, more secure, and stable.



Automatically turn off the lights when there is no vibration for 30 seconds, and turn on automatically when you feel the vibration
(Except in constant light mode)

Two ways to install:

  1. Saddle Mount: sits under your existing seat (works for most bikes)
  2. Seat Mount: wrap it around your bike seat post (the pole leading to your seat)

You’ll be set up in 2 minutes flat!




COB LED + Ensca lens

High visibility at night but not dazzling


Old Model-fog Lens

Low cost, simple process, soften the light by reducing brightness

Q5-Optical Lens

High cost, complicated process, keep light transparent and bright without glare

Old Model-LED Patch

Low cost, simple process, and short life
More dazzling at the same brightness

Q5-COB Inversion

High cost, complicated process
Longer life, more stable
Softer at the same brightness

Brake Sensing-Integrated Accelerometer

Q5 comes with a built-in accelerometer/high-performance MCU and powers by the three-level digital filter algorithm which ensures correct detection of a brake


Smart Light Sense

Built-in light sensor
Works in harmony with vibration induction
Smart Start and stop saves power

The SOS and Bright modes are manually controlled and are not affected by the sensing element

Battery Indicator

The indicator light flashes every 6 seconds, prompting the current battery

Switch modes at will

Click to switch the flashing mode: Flashing-Breathing-SOS-Shutdown

IPX6 Waterproof Design

Proper to any abusive environment

Compact and Lightweight design

CNC Aluminum Alloy Shell

Anti-scratch and anti-fall

Product Details:

1. Full 6061 Aluminum alloy chassis.
2. Automatically turn on/off depending on the light intensity and motion.
3. Automatically switch to sleep mode to save power.
4. Seat rail mounting
5.4 flash modes.
6.20hrs+ run time.
7.400mAh Li-ion rechargeable battery.
8.USB charging.
9. Battery indicator (flashes every 6 seconds)
10. Compact and Lightweight design (55g).
11.IPx6 Waterproof.


  • We truly believe we make some of the most innovative products in the world, and we want to make sure we back that up with a risk-free 30-day guarantee.
  • If you don’t have a positive experience for any reason, we will do whatever it takes to make sure you are 100% satisfied with your purchase.
  • Buying items online can be a daunting task, so we want you to realize that there are absolutely ZERO risks in buying something and trying it out. If you don’t like it, no hard feelings we’ll make it right.
  • We have 24/7/365 E-mail Support. Please contact us if you need any assistance.

Customer Reviews

Based on 10 reviews
Great little light

I bought this to put on the back of my golf cart as a tail light. It works great and even gets brighter when you hit the brakes. I like that you can charge it by usb. It's worth the price.

Great Design!

This is an amazing brake light for your bike. In a big bike city like Long Beach this brake light is extremely useful. It provides a very safe riding experience at night on the narrow busy streets around the city and by the beach. With so many people and the cars on the roads around Long Beach this light provides an additional amount of safety. This bike brake light is almost as bright as a brake light on a car that almost commands attention from other drivers/riders on the road at night. No wires and it still knows when you brake on your bike to brighten the light; exactly like a brake light. I find this light for this price one of the best items I have ever purchased on Riderlygear. It's just amazing how simple and effective this light makes riding your bike at night. Highly recommend ed.

Helps with safety and is portable

This product worked great the first few times I used it, especially since daylight savings time just ended. During my commute home, it stays tightly in place with the included mounting strap. Also, it is easy to remove and take the light with you, by unscrewing it from the mount if you leave your bike unattended for long periods of time.

Very happy with these lights.

I have been commuting 4x a week with this light for about 3 months. I rode 20 minutes each each to work, and I always leave it on the red/blue alternating setting. I live in a sketchy area of Atlanta, lots of bad/oblivious/inconsiderate drivers. Since using this with the blue/red setting, I think a lot of drivers assume I'm a cop in a bike, because they now pass me carefully and slowly, and leave me more space.

Set it and forget it

I love this light! I turn it on and leave it on. It goes to sleep automagically when the bike is still. I installed them on two of my bikes a couple of weeks ago and haven't had to charge them yet. I ride about 4-5 days a week one bike or the other, about 8 miles a day and one 25 mile ride as well. I really like that they sense my braking and, since I'm not looking at the light when I'm riding, folks I ride with say it looks legit.