a microprocessor, able to receive signals sent from a power supply unit, an RC timer circuit, a reactivation circuit and a switch and able to process and analyze these signals;

the power supply unit, connected with the microprocessor so as to supply electricity to the microprocessor;

the switch, connected with the microprocessor, which may detect the number of times that the switch is pressed;

the RC timer circuit, connected with the microprocessor and able to receive the signals sent from the microprocessor so as to measure the periods of time that the switch is in the OFF and ON conditions and then send data to microprocessor so that the microprocessor will be able to accurately determine the number of times that the switch is pressed;

an activation unit, comprising a plurality of activation circuits and connected with the microprocessor so that the activation unit activates a light unit according to the command of the microprocessor, wherein each activation circuit activates a set of lights; and

the light unit, comprising several sets of lights and connected with the activation unit so that the light unit is activated by activation unit, wherein all or a part of the lights of the light unit are turned on in their full brightness, one half of their full brightness, a portion of the full brightness or in flashing light.