This taillight features brake detection and automatic illumination. Even if the battery runs out, you can continue riding by replacing it with AAA batteries. I am selling this because I purchased a new taillight. Regarding Important Notes: ・There is no box or seat post mounting band, etc., other than what is shown in the photos. ・I will include the CATEYE genuine bracket (RM-1) for attaching to the saddle rails. Regarding the Condition of the Product: ・Light Body If you look closely at the photos, you can see fine scratches on the light body case, but because it was installed under the saddle, there is no blue rust on the parts that touch the batteries. ・Bracket The grooves that maintain the angle are not worn, so the light is securely fixed. When adjusting the angle of the light, refer to photo 5 and be sure to move the slider. For other details, please check the manufacturer's website: https://www.cateye.com/jp/products/safety_lights/TL-LD180K/ https://www.cateye.com/jp/products/parts/5446510/ CAT EYE Taillight Rear Light TIGHT KINETIC TL-LD180K Brake