Connecticut Electric AL20Mor Aqua Buoy 20-Inch Solar Lighted Mooring Buoy, White with Blue Stripe Rechargeable batteries last for 2 years LED's last for 100,000-hours or 20 years Buoy will glow all night long. (Up to 20 straight-hours) Unique "Bell shape" keeps the buoy vertical in the water Find your mooring buoy easily at night