Retrospec Bicycles Bub-1 Ultra Bright 1 LED Urban Commuter Bike Light Ultra bright White/Red LEDs make this the most affordable compact bike safety light Rounded design enables up to 1 mile and 220 degree light range and runs up to 100 hours on included CR2032 battery Comes with seat post mount and handle bar bracket Easily snaps off of mount for safe storage when not riding Runs efficiently on CR2032 (included) battery power that can last up to 100 hours