You charge the batteries using the built in solar module the casing can be stuck in the ground or attached to a wall the light tube can be switched to flashing or constant light it automatically switches on when dusk falls chain with 50 warm white leds flashing or constant light length of tube approx 7 m crystalline 06 wp solar module even works in the winter comes supplied with a rechargeable battery technical details light colour warm white 2800 k solar module 06