Thank you for viewing! This is a unique, bone-shaped, high-brightness safety tail light. It provides a wider field of vision and is highly visible from the road, making it useful for cars, motorcycles, and other bicycles when riding at night. This LED safety light is designed for riding on dark roads, making it very convenient for nighttime cycling. 【Brightness Adjustment Multi-Flash Mode: 5 Modes】 High Brightness Low Brightness Fast Flash Slow Flash SOS Flash By pressing the switch button on the tail light, you can switch between the 5 lighting modes. The LED specifications provide the safety necessary for road traffic. In case of danger, the SOS emergency mode and flashing mode will send a distress signal to seek help from those around you. 【USB Charging】 This is a USB rechargeable battery, so it can be recharged repeatedly, and no battery replacement is required. Charging time: 1 hour Lighting time: Approximately 10 hours 【Waterproof Design】 This is an IPX4 standard waterproof and dustproof type for road bikes, with a waterproof design that can withstand jets of water from various directions and a design that prevents dust from entering. It can be used in bad weather. 【Easy Installation】 It can be easily installed and removed in seconds on the seat post or handlebar without using any tools. 【Product Specifications】 ■ Material: ABS + Aluminum Alloy ■ Weight: 25g ■ Size: 59x35x57mm ■ Package Includes Bicycle Tail Light x 1 Velcro Strap x 1 USB Cable x 1 【How to Install】 Please refer to the images. The power is turned on by long pressing. It can be easily installed by simply wrapping it around with Velcro. It will not fall off if securely fastened. The brightness is sufficient for riding late at night. Bicycle Tail Light USB Rechargeable Waterproof Tail Light For Bicycles Safety Light High Brightness LED Light Lightweight Road Bike Mountain Bike Small Bicycle Rear Light Tail Lamp