Square Button “up”“down” color blue light with cable elevator push button

Square Button “up”“down” color blue light with cable elevator push button Button switch what category a, push button switch are classified according to the purpose and the structure of contact 1, normally open,2, normally closed button button 3, composite button, button switch may be classified according to the operation way and protection way, the common button type and characteristics: waterproof type: with sealed enclosure, can prevent water intrusion 1.Working Voltage