These automatic on-at-dusk lights are great for pilings and docks. 

• Size 4-7/8" x 3-15/16"
• 6pc LED is visible for 1000m
• Constant/Flashing/Off switch
• Flashes 35 times/minute
• Runs for 45 hrs flashing or 20 hrs constant on a full charge
• Lithium 1000mAh non-replaceable battery
• IP 44 Waterproof Rating

RATINGS

• Unit has 6 LED lights
• 40 lumens emitted
• 20 hour runtime on full charge
• For fresh & saltwater locations
• Battery/battery pack NOT replaceable by user