Plastic switch for alarm use

Features - Color: Black - Materials: Plastic and magnet - Dimensions: 2.3 x 1.9 x 1 cm - Note: Normally closed signal (conductor engaged when the door is opened, disconnected when the door is opened, connected to the alarm control unit). - Very practical and useful contacts. - Magnetic switch operated by a magnetic field. - Easy installation and use. - The circuit is closed when the magnet is closed.