pin and is a pwm signal comprising multiple high potentials and multiple low potentials changed alternately with reference to fig5 the high potentials von and the low potentials voff respectively perform in short intervals such as seconds under the control of the led control signal the led module 50 may be operated in a full light mode a repeating mode or a flashing mode the modes are changed sequentially when the mode switch s 1 is pressed or changed according the mode signal sent from the wireless control module 70 the time control signal is sent out via the seventh pin and comprises high potentials and low potentials changed alternately with reference to fig6 the high potentials von and the low potentials voff are respectively maintained for a certain time such as several hours for example the low potential occurs in the night while the high potential occurs in the daytime the regulator d 2 can be a zener diode and is connected between the first pin and the eighth pin of the controller 21 the regulator d 2 is used to protect the controller 21 from unusually high voltages the timer module 30 is connected to the power module 10 in series in this embodiment the timer module 30 has a fifth electric switch q 5 which is a pnp bipolar junction transistor bjt the fifth electric switch q 5 has a base an emitter and a collector the emitter is connected.