Quick Summary
The black ROCKBROS Smart Bike Tail Light, model 2420002001/USA, is a rechargeable rear bicycle light with a brake sensor, six light modes and two brightness levels. It has a 420mAh battery, Type-C charging and two mounting options.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Battery and charging | 420mAh battery with Type-C charging. The stated runtime is approximately 11 to 45 hours; the listing does not give a runtime for each mode. |
| Light settings | Six modes, two brightness levels and a gear memory function that retains the selected setting after restart. |
| Brake sensing | When braking is detected, the light brightens and flashes rapidly for about 3 seconds. |
| Mounting and angle | Includes saddle-bow and seat-post brackets. The light angle adjusts up and down. |
| Light elements and shell | Optical main beads, 24 COB beads on the outer ring and an aluminum alloy shell. |
| Model and quantity | Model 2420002001/USA; one black light. |
| Warranty | The listing states a 2-year manufacturer warranty; check the applicable terms for the item. |
What to Compare Before Buying
The approximately 11-to-45-hour runtime range is not broken down by light mode. If runtime is important, compare the mode you expect to use with any available mode-specific runtime details. The listing also gives no numerical light-output rating, so use a stated output value when comparing brightness.
Charging uses Type-C. Confirm that your charging setup has a compatible connection.
Compatibility, Size and Fit
The listing describes a saddle-bow bracket and a seat-post bracket with elastic rubber rings, and says the seat-post option suits round and special-shaped tubes. Check the mounting point and selected bracket against your bicycle before choosing a position.
How It Works
The brake sensor triggers a brighter, rapid flash for about 3 seconds when braking is detected. The light also offers six modes and two brightness levels. Its gear memory function retains the selected setting after restart. Red indicates charging and green indicates a full charge.
Plan a Pre-Ride Light Check
Before heading out, confirm the bracket is secure in the chosen mounting position and adjust the light angle. Select the intended mode and check the battery status; if you plan to rely on brake sensing, confirm that the feature responds before the ride.
Before You Decide
Check bracket fit and mounting position, consider whether the stated runtime range suits your expected use, and confirm Type-C charging works with your setup. This is one light with a 420mAh battery.
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