I'm selling this because I bought it as a sub-light but never used it. The following is a product description quoted from the official website: Rechargeable light with a maximum of approximately 130 lumens Headlight compliant with JIS C9502 (when lit) Wide beam design using OptiCube™ technology, enhancing visibility and being seen 2 modes: constant and flashing Mode memory function: starts in the mode it was in when turned off Battery indicator to show remaining battery life (maintains headlight brightness for approximately 30 minutes after the indicator turns red) Easy-to-attach and detach rubber band