1. Smart vibration brake sensor, automatically brightens when braking to prevent rear-end collisions for night riding 2. 6 lighting modes available. Long press for power on/off, short press to switch modes for different riding conditions 3. Digital power display, real-time battery percentage check, avoid unexpected power off outdoors 4. Type-C rechargeable, built-in 500mAh battery for stable and long-lasting use 5. IP55 water resistance rating, sturdy PC shell, shockproof and corrosion resistant for rainy days 6. Two mounting brackets, fits saddle and seat post, easy to install and compatible with most bikes 7. Dimensions: 3.4cm x 3.2cm x 3.2cm 8. Weight: approx. 30g
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