【Vibration Intelligence Sensing & Smart Brake Warning｜The Core of Safe Riding】 Equipped with a high-precision G-sensor, it instantly switches to a flashing red light at maximum brightness when deceleration or braking is detected while riding. This reliably alerts vehicles behind you, preventing rear-end collisions at night or on downhill slopes. **Important:** The brake-sensing function only operates in "Smart Vibration Sensing Mode." It does not function in manual modes such as constant-on. Please note (mode switching is possible with a double-click of the button). 【7-Color LED x 4 Modes｜Customize to Color Your Bike】 In addition to the standard red, you can switch between a total of 7 colors: blue, green, purple, cyan, yellow, and white. It features 4 modes, including "Constant On," "Flowing Flash," and "7-Color Cycle," allowing you to coordinate with your mood or frame color. It ensures visibility while stylishly enhancing your night rides. 【Automatic Shut-Off & Automatic Power-Off｜Effortless Energy-Saving Design】 In Smart Mode, it automatically turns off (standby) after remaining still for more than 30 seconds. It automatically turns back on when vibration is detected again. Furthermore, the power completely turns off after remaining still for more than 30 minutes while parked, preventing unnecessary battery consumption. ※ Continuous use for approximately 15 hours is possible (varies depending on the mode used). 【USB-C Fast Charging & Battery Level Indicator｜Peace of Mind for Long Distances】 It adopts a versatile USB Type-C port and fully charges in about 2 hours. Equipped with a large 430mAh battery. You can check the battery level in real-time with the 4-stage LED indicator on the side, eliminating anxiety about sudden battery drain during commutes, school trips, or long rides. 【Compatible with Both Saddle/Seatpost & IPX5 Waterproof】 Two types of mounts are included: "for saddle rails" and "for seatposts." It can be easily installed without tools and is compatible with a wide range of vehicles, including road bikes, cross bikes, and MTBs. The IPX5 water-resistant specification provides peace of mind in sudden rain or splashes. ※ Note: It is not completely waterproof, so avoid submersion. It may not fit some special aero-shaped (extremely flat) seatposts. P03835