DC 110V 0.5A NC White Cylindrical Window Door Magnetic Switch Home Alarm

Specification:

Description:

• Suitable to used on the windows or door of apartment, hotel, office, etc.
• The entry alarm adopts magnetic sensor design to warn you if  the strange entry from the windows or door.
• Once the two part of this switch set is separated, it will warning you somebody is coming in with loudly and harsh sound.
• Switch Type: NO(normal open type),  NO means Normally Open:When the door or window is open, the contact will give an open signal and when the door is closed the contact will give a closed (circuit) signal.