1. Connect "+" battery to the output "1", and to the conclusions "2" And "3" and check that the buzzer works.
2. Disconnect the wire from the terminal "2", check that the buzzer turns off.
3. Under the conditions of point 1, disconnect the wire from the output "3", check that the buzzer turns off.
4. Under the conditions of point 1, connect "+* to the conclusion "5", check that the buzzer turns off.