The Ravemen TR-500 USB Led Tail Light is a compact and bright rear bike light that provides 500 Lumen of red light. This rear light features detachable light/flashlight capabilities, a hi-lo beam, and is water-resistant. It is made of aluminum and plastic materials, is lightweight at 77g, and comes with rechargeable batteries that can be easily charged via USB. The sleek design and durable construction make it a reliable and stylish accessory for cyclists looking to enhance their visibility on the road.