They arrive as you'd expect, lights attached to a wire and they have a box 4 inches square on the end which is the solar cell. Ive Never used LED before but. The solar cell has an off/ on button and a mode button. The three modes (?) are on continually / flashing / and off. Mine came on at about 4.30 pm and they were still running this morning at 7 only to be switched off by the daylight. Now that's good. I also bought a multi coloured set which have to go back.