(8 Pack) Green Aluminum Solar Powered Road Stud Deck Dock Lights Provides up to 18 hours of light and has a visual distance of 800 yards Maximum load/Compression capacity: 30 tons Rechargeable Battery included (Ni-M 1200mAH) 100% Solar Powered no external wiring necessary Dimensions: 4.3" x 3.9" x 1.2" (L x W x H)