---
product_id: 640666382
title: "Serfas Thunderbolt USB Taillight"
brand: "serfas"
price: "HK$10"
currency: HKD
in_stock: false
reviews_count: 10
url: https://www.desertcart.hk/products/640666382-serfas-thunderbolt-usb-taillight
store_origin: HK
region: Hong Kong
---

# 35 lumens brightness USB rechargeable Water resistant Serfas Thunderbolt USB Taillight

**Brand:** serfas
**Price:** HK$10
**Availability:** ❌ Out of Stock

## Summary

> 🚴‍♂️ Light Up Your Journey with Safety and Style!

## Quick Answers

- **What is this?** Serfas Thunderbolt USB Taillight by serfas
- **How much does it cost?** HK$10 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/640666382-serfas-thunderbolt-usb-taillight)

## Best For

- serfas enthusiasts

## Why This Product

- Trusted serfas brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Charge & Go:** USB rechargeable in just 3.5 hours for hassle-free use.
- • **Versatile Modes:** Choose from high beam, low beam, and two flash modes to suit your needs.
- • **Extended Run Times:** Enjoy up to 9.5 hours of low blink mode for those long rides.
- • **Weatherproof Wonder:** Designed with a water-resistant silicone body for all conditions.
- • **Illuminate Your Ride:** Experience 35 lumens of pure red light for maximum visibility.

## Overview

The Serfas Thunderbolt USB Taillight is a cutting-edge safety light designed for cyclists, featuring 35 lumens of brightness, USB rechargeability, and a water-resistant body. With multiple modes and impressive run times, it ensures you stay visible and safe on every ride.

## Description

Product Description          Serfas' Thunderbolt Taillight gives you style and safety in one high-powered and affordable package. Being seen on your bike at night never looked so good until Serfas' Thunderbolt Taillight hit the scene. This USB rechargeable gem comes with 35 lumens of firepower while giving riders' several different rear facing mounting options. The 30 micro-LED strip will let your presence be known to cars and bikes alike. The rechargeable Lithium Polymer battery will have you saying good bye to buying additional batteries and hello to saving the earth and all your hard earned money. Charge up, light up and get riding safely with the Thunderbolt.             From the Manufacturer          Serfas' Thunderbolt Taillight gives you style and safety in one high-powered and affordable package. Being seen on your bike at night never looked so good until Serfas' Thunderbolt Taillight hit the scene. This USB rechargeable gem comes with 35 lumens of firepower while giving riders' several different rear facing mounting options. The 30 micro-LED strip will let your presence be known to cars and bikes alike. The rechargeable Lithium Polymer battery will have you saying good bye to buying additional batteries and hello to saving the earth and all your hard earned money. Charge up, light up and get riding safely with the Thunderbolt.

## Features

- The industry's most technologically advanced safety lights
- All lights are robs compliant and all testing is done in house
- More efficient leds & high quality lenses to increase brightness & Clarity
- Produces 35 lumens of pure red light
- USB rechargeable light, that fully charges in 3.5 hours
- Features 30-mini LED strip
- Features a water resistant silicone body and unique mounting options
- Modes: high beam, low beam and two flash modes Run times: 1.75 hours (high beam); 3 hours (low beam); 7 hours (high blink); 9.5 hours (low blink)

## Images

![Serfas Thunderbolt USB Taillight - Image 1](https://m.media-amazon.com/images/I/41dCzRTybFL.jpg)

## Available Options

This product comes in different **Color** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    The Best and Only Taillight I'll Use
  

*by E***E on Reviewed in the United States on September 28, 2014*

First off, I commute A LOT at night and I am very choosy about the lights I use on my bike. I've been using this a few months shot of a year and can confidently say it is the best and only taillight I'll use. This thing is bright! I mean the kind of bright that would annoy motorists who are too close, which is a good thing! It does a great job at getting someones' attention which is the purpose of using a taillight. It attaches relatively easily to most points on a bike including but not limited to the seat-post, the rear triangle, a milk crate, etc.. The battery will generally go a week or two without really needing charging if I use the pulse modes, but it is easily charged with the USB cable it comes with. And in case anyone is wondering I have used this when it is raining and have dashed trough puddles with it in the line of fire and it is still kicking, so wet weather use is definitely OK. IMPORTANT: 40 Bucks may seem like a bit much for a taillight, but this thing is worth every penny, it is just an excellent choice for those who have to ride at night or in inclement weather. Ask yourself, is saving a couple bucks really worth a trip to the emergency room?

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    One of the best out there.
  

*by J***N on Reviewed in the United States on November 5, 2020*

As a guy who has biked 6,000 miles per year for the last 6 years, I have found some lights lacking, but this is not one of them. In fact, it is the best group ride tail light that I have used. I got my first one with a used bike that I purchased. It never failed until I accidentally let it get submerged in rain water. ...So I bought another on soon after that.Why is this so good for group rides?  ...Well, because when you are with a pack, all of those retina burner lights with the white flash in the center can make fellow riders aggravated. / We even had a person have an accident due to being somewhat blinded by an intense blinking tail light and then going into a very dark trail.This Serfas light has 4 light modes plus off.  The light can be seen for a mile and can be bright, but it is not so hard to look if you are riding behind it, because the light is all red and is distributed along a panel, with no mega-white center, etc.The battery lasts very long and seems to be able to go all day, even when you use the constant-on mode.This is my group-ride go-to light, and I am very picky about this sort of equipment.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Great Rechargeable Light
  

*by J***K on Reviewed in the United States on December 10, 2012*

My wife and I are commuting cyclists and have started using Surfas rechargeable lights almost exclusively. The UTL-6 is extremely bright, brighter than any other 20-30 dollar battery powered taillight I've used in the past. I think it is worth the extra cost.Reasons I like it.1. Brightness.2. Since I ride multiple bicycles, I like that it doesn't need a mount to attach to the bike. Clipping those hard plastic tabs to your belt loop isn't always ideal, and generally results in the plastic breaking. I've found the rubber on the Surfas lights to be strong enough to be taken on and off again over and over and over without feeling like I'm stressing the product.3. Surfas has used the same cable for charging over several generations of the USL/UTL series. I have Surfas lights spanning 4 years of product line, and they all us the same USB Mini adapter, which is a standard cable, easily found in most houses with technology at this point.Things I don't especially like.1. It's a bit bulky, but I can't complain because of the brightness. It still can fit in your pocket without too much trouble.2. USB Mini is good, but USB Micro would be a good switch in future generations, as Most (non iPhone) phones use this size now. I long for the day when I only need one type of cable for charging everything!3. If you don't have much seat post exposed on your bike, you might need to get creative with where you attach the light, but probably not too much of an issue most of the time.

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**Shop now:** [https://www.desertcart.hk/products/640666382-serfas-thunderbolt-usb-taillight](https://www.desertcart.hk/products/640666382-serfas-thunderbolt-usb-taillight)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-01-22*