I purchased this from Amazon and have been using it for about a month. I have confirmed that it is working properly. Here are the product features: Maximum Brightness: 60 lumens (using high-performance COB LED) Excellent Visibility: Illuminates a wide area day or night to ensure safety Lighting Modes: 6 types (constant on / breathing flash / comet flash / fast flash / mixed flash / eco flash) Brake Detection Function: High-intensity flash to warn those behind when decelerating or stopping Smart Auto Function: Automatically turns off after 30 seconds of inactivity, and automatically turns on when restarted Waterproof Performance: IPX5 (rainproof) Weight: Approximately 50g (lightweight and slim design) Battery: 500mAh (up to approximately 24.5 hours of illumination) Charging Method: USB charging (with power indicator) Mounting Method: Easy to install with metal mount or rubber band Compatible Vehicles: Road / gravel / MTB, etc. SHARKODIN Smart Bicycle Tail Light 60 Lumens Tail Light 230-degree Visibility 1000m Visibility Range USB Rechargeable Smart Bike Brake and Motion Sensor Light MTB Road/Urban Cyclists SHARKODIN Smart Bicycle Tail Light 60 Lumens Tail Light 230-degree Visibility 1000m Visibility Range USB Rechargeable Smart Bike Brake and Motion Sensor Light MTB Road/Urban Cyclists