IC-2N3906 Simple signal generator circuit

This circuit is a simple signal.It can generate signals, both light and sound Alternating.Which can be applied to work. For example Taillight of bicycle or Turn left and the right of the bicycle. Etc.
When entering into power supply circuit. by circuit will have Q1 and Q2 to be astable multi vibrator. This will work in any way ON and OFF.Or vice versa on all the time.And Pin Collection (C) of the two transistors.Connected to the light source device (LED1-LED4).For the audio source device is Buzzer BZ1.While the one ON transistor will allow the device is connected to pin C is running.The signal alternates between light and sound all the time.