Esaytool Variable Brightness Bike Tail Light, Brake Sensing Bicycle Rear Light, ...

Features

• •Emergency Brake Flash: Delivering 200 lumens of ultra-bright output with a high-efficiency optical lens for a wide 220 degree beam angle. Built-in 3D motion sensor boosts brightness to 300 lumens when braking, ensuring visibility range up to 1000 meters. Professional grade safety for every ride!
• •Lightweight & Durable: Made with a PC optical lens + aluminum alloy housing. Includes a nylon mount for seatpost mounting only. Compact size: 1.57" diameter, 1.34" length, and just 0.1 Ib weight. Rated IP66 for waterproof & dustproof performance—ready for heavy rain.
• •Dimmable & Modes: Features Flash, Pulse, Strobe, and Constant modes, controlled by two buttons. Short-press the power button to cycle modes; Short-press the brightness button to adjust light intensity (8 levels). Long-press the power button to turn off, and it will automatically restore your last-used lighting mode and brightness upon next startup.
• •Indicator & USB-C: Equipped with an 800mAh lithium battery (USB-C 5V charging). LED indicator lights up during charging and turns off when fully charged (about 3 hours). A full charge delivers 3-300 hours of runtime. On startup, brightness will pulse twice if battery is below 50%, or three times if below 25%.
• •Auto Mode: Flash and Pulse modes include smart programming to detect ambient light and motion, auto-off in daylight and auto-on at night. If idle for 30 seconds at night, the light shuts off but reactivates when riding resumes. (This auto feature cannot be disabled. you can choose Strobe and Constant modes as a daily riding choice.)