Item: solar road stud Model: FR-R001 Features: 1) High visibility LEDs incorporated into the light help ensure safe Night time driving. 2) Being solar powered, these products can be used in isolated or Stand-alone applications. Specifications: 1) Solar Power: 0.25W 2) Storage Battery :1.2V/1800mAh 3) Charging Time: continuous 30 hrs 4) Size (mm): 145*130*75 5) Net Weight (N.W.):685g