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 holesallow for 1/4"x1" Stainless Steel screws (not supplied)that secure thelight to the topof the bracket(sold seaprately). Reccomend getting the SS nuts tack welded to prevent tampering. Discount coupons not premitted forbuoy items. Prices will be corrected on order submission as appropriate in relation to theprice structure.