This is a seatpost-mounted tail light. It's small and lightweight, easy to install, and very bright with sufficient light output. It has five lighting modes: constant on (high), constant on (low), flash, energy-saving, and smart. I purchased it new three months ago and used it a few times. There are no scratches or dirt. Manufacturer: OLIGHT Model: SEEMEE 30 C Specifications: Dimensions: 65.5 x 25 x 22.5 mm Weight: 22 g Impact resistance height: 1 m Full charging time: 2 hours (5V 500mA) Number of rechargeable cycles: Approximately 500 times Condition: Almost like new Accessories: Mounting band, USB charging cable, instruction manual Please check the photos. Please consider this item understanding that it is a used product. Shipping method will be Yu-Packet Post Mini.