Thank you for viewing! This is a unique, bone-shaped, high-brightness safety light. It widens your 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 cyclists! 【Brightness Adjustment Multi-Flash Mode: 5 Modes】 High Brightness Low Brightness Fast Flash Slow Flash SOS Flash You can switch between the 5 lighting modes by pressing the tail light's switch button. 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 charged repeatedly, and no battery replacement is required. Charging time: 1 hour Lighting time: Approximately 10 hours 【Waterproof Design】 IPX4 standard waterproof and dustproof type for road bikes, with a waterproof design that can withstand jets from various directions and a latest design that prevents dust from entering. It can be used in bad weather. 【Easy Installation】 Easy to install and remove in seconds without tools on the seat post or handlebars. 【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 button requires a long press. It can be easily installed by wrapping it around with Velcro. It will not fall off if securely fastened. The brightness is sufficient for riding late at night. Depending on how you use it, you can use it at a pace of charging every 3-4 days, using it for about 40 minutes a day. 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