This is the Yellow Flashing light that meets Canadian Private Aids to Navigation standards for a mooring buoy. It has a 0.5 second flash every 4 seconds (programmed flash code 064) FL4-0.5s. It is solar powered and has a magnet in the base for winter and long term storage so that the battery is not damaged by over discharge during storage. The holes allow for 1/4″x1″ Stainless Steel screws (not supplied)that secure the light to the top of the bracket(sold separately). Recommend getting the SS nuts tack welded to prevent tampering. Discount coupons not permitted for buoy items. Prices will be corrected on order submission as appropriate in relation to the price structure.