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Smart Ultra Bright Waterproof Bike Tail Light Auto On/Off Sensor

47 reviews
100% of buyers enjoyed this product! 1647 orders
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Product information:
Material: Aluminium alloy+ABS+PC
Brightness: 20 lumens brightness.
Battery capacity: 350mAh Li-ion re-chargeable battery.
Lamp Bead: COB LED
Waterproof rating: IPX6
Lighting mode: Steady light/ Breathe flash/ Slow flash/ Quick flash/ Rhythm flash/ ECO flash (6 modes)
Wide angle: 220°
Irradiation length: 500m irradiation length
Application: Helmet, Seatpost, Saddle Mount, Dog, Backpack

【AUTOMATICALLY START & STOP】——With brake sensor inside, Bike tail light will turn on automaticlly riding in low brightness and turn off in high brightness. The taillight will quickly switch to strong light mode for to warn the approaching drivers behind you when you are braking, which could make you a safer cycling.
【Freely switch taillighting modes】——6 mode options: Steady light, Slow Flash, Fast Flash,Rhythm flash, Breathing Flash,Eco flash,According to different occasions,automatic choose to switch to different lights,to get the best Cycling experience.

[Ipx 6 Waterproof & Super Bright]-Our led lights are sealed with high-quality aluminum alloy material, which is waterproof and dustproof. It can provide super brightness during the day and night, and it can perfectly ensure your safety even in heavy rain and fog weather.

【Battery duration&USB RECHARGEABLE】2 Hours Charging =17 to 54 Hours Working. The built-in 400mAh polymer lithium battery comes with a USB cable, with quick charge just connect the cycling light with any USB devices such as power bank, car charger or AC outlet adapter. which also serves as helmet light, backpack light, dog light, scooter Warning light, wheelchair Warning light and wherever you need it.

【Easy to install】—— with no tools saddle installation and seatpost installation can be applied to any bike. Quick to install or remove bicycle, mountain bike MTB, hybrid or commuting bike, etc.


We are proud to offer international shipping services that currently operate in over 200 countries and islands world wide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.

How do you ship packages?

Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.

Do you ship worldwide?

Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.

What about customs?

We are not responsible for any custom fees once the items have shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.

How long does shipping take?

Shipping time varies by location. These are our estimates:
Location *Estimated Shipping Time
United States 10-30 Business days
Canada, Europe 10-30 Business days
Australia, New Zealand 10-30 Business days
Central & South America 15-30 Business days
Asia 10-20 Business days
Africa 15-45 Business days
*This doesn’t include our 2-5 day processing time.

Do you provide tracking information?

Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.

My tracking says “no information available at the moment”.

For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.

Will my items be sent in one package?

For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.

If you have any other questions, please contact us and we will do our best to help you out.


Order cancellation

All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.


Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:

  • If you did not receive the product within the guaranteed time( 45 days not including 2-5 day processing) you can request a refund or a reshipment.
  • If you received the wrong item you can request a refund or a reshipment.
  • If you do not want the product you’ve received you may request a refund but you must return the item at your expense and the item must be unused.

We do not issue the refund if:

  • Your order did not arrive due to factors within your control (i.e. providing the wrong shipping address)
  • Your order did not arrive due to exceptional circumstances outside the control of Amazmerch (i.e. not cleared by customs, delayed by a natural disaster).
  • Other exceptional circumstances outside the control of

*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.


If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.

Please do not send your purchase back to us unless we authorise you to do so.

Real customer reviews

47 reviews
100% of buyers enjoyed this product!
5 stars
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1 star
verifed buyer
21 Dec 2021

Very good product, no need to turn on our off, it does it automatically. I would recommend this product riding their bikes in low light environment.

verifed buyer
20 Dec 2021

I really like this light. I do a ton of night riding and wanted something I could securely fasten to the bike for night riding on trails. Looks good, fits great, has neat patterns, and I am yet to kill the battery so I think it is pretty sweet.

verifed buyer
18 Dec 2021

Quality is super! Thank you store!

verifed buyer
18 Dec 2021

This is a great bike light and it does what it's supposed to do as you're moving at a decent pace on your bike and start slowing down the brake light shines very bright, but the only thing that discourages me is that you have to charge it every 2 days but only takes about 5 minutes to charge all the way since it's so small. I really like this light and it's a great safety feature because people will see you from behind and see that you're applying break pressure. Highly recommended.

verifed buyer
18 Dec 2021

Works really well. Has the option for three different settings, and is hunky visible. Will get about 30 hours of use for each charge. Looks good and works well.

verifed buyer
17 Dec 2021

I got this rear taillight a few weeks ago and have been quite happy with it. It's quite small and feels well built. My main purpose for getting this light was because it was able to mount to the seat rails. The light if fairly bright and the battery life seems pretty good so far. If I had one critique, I would like the light to not be flush with the housing so you could see of from the side a bit better. One a side note, the customer service was quite good. I would recommend already have a second for my other bike.

verifed buyer
17 Dec 2021

Amazing. Great design great visibility great options for light patterns. Holds charge for decent time between charges. I really like the pulsing light pattern. A+ and I'm really picky. This is a great tail light for your bicycle. If youre into the light design, I can vouch for its reliability. It works really good.

verifed buyer
15 Dec 2021

I liked this item so much I ordered a second to replace my 'bike sparks' light which was not reliable coming on/ going off and showing braking when I am riding full speed! Thankfully those problems do not exist with this item, you can be sure it IS ON and it shows braking/slowing at the correct time.

verifed buyer
15 Dec 2021

A nice light that works really well. No need to turn it off. It lights when in motion and the brighter stop light is authentic. Charge last a long time. Two choices for mounting. Good product.

verifed buyer
15 Dec 2021

I’ve bought three different rear tail lights for my bike which didn’t really work well for me. The first one didn’t have a break light, so I bought one that has the breaking feature, but it wasn’t very bright. Then I saw this one at a great price so I jumped on it. So far I love it! Plenty bright enough for daytime riding and the breaking feature works better than the much more expensive one that I bought, but the best thing is how easy it is to twist off and charge. It’s hard to say how long the battery lasts because it’s so easy to charge, I do it every time I charge my horn, so I’ve never had it run out.

verifed buyer
14 Dec 2021

Havent had it long but works great. Would like yo have a screw hole in the mount to fasten with a small bolt. Otherwise works as expected.

verifed buyer
12 Dec 2021

Perfect for the desired application

verifed buyer
11 Dec 2021

Mounted fast and easy and has multiple option for display

verifed buyer
9 Dec 2021

Easy to install. Easy to charge. Different flash settings and long battery life.

verifed buyer
8 Dec 2021

This light works very well! Great quality and function. The AI braking function works well! Easy to charge with a simple twist for removal. Very bright with different modes to chose from.

verifed buyer
7 Dec 2021

Easy to mount, easy to charge and easy to use without the instructions. Does the job.

verifed buyer
7 Dec 2021

item described, very satisfied, highly recommended

verifed buyer
6 Dec 2021

Very good quality for the price. Break light works surprisingly well.

verifed buyer
6 Dec 2021

Super easy to charge and install. Different flashing displays long lasting and highly visible

verifed buyer
1 Dec 2021

Fairly easy to install. Comes with several options for being able to mount on your bike, so should cover any bike.

verifed buyer
1 Dec 2021

Multi functions, the flasher setting is bright enough to be seen in bright sunlight. Comes with 2 mounts. I use the under seat mount on 1 bike and the post mount on my other bike.

verifed buyer
26 Nov 2021

like everything about this and its great for safety

verifed buyer
25 Nov 2021

Easy to mount. Very bright. Car drivers can see the light way before they can see the bike!

verifed buyer
24 Nov 2021

Gave 5 stars for best bang for the money, I like the aluminum housing and the east mounting set up !

verifed buyer
23 Nov 2021

I really like this little tail light. It's high visibility and the addition of an accelerometer within it to activatethe brake light is really great.

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