This is a small tail light for seatpost mounting. It's easy to install, has a long battery life, and is bright for its size, making it a user-friendly light. I've used it for about three months, but it's in almost new condition. Product Name: CatEye Tail Light ORB SL-LD160-R Size: 26 x 26 x 51.8mm Weight: 26g (body + batteries) Batteries: Lithium batteries CR2032x2 Runtime: Constant/50 hours, Flashing (Rapid)/100 hours, Flashing (Slow)/100 hours Please check the condition in the photos. Please consider this item with the understanding that it is a used product. Shipping is planned via Yu-Packet Post Mini.