These are the door contact sensors that are in use with any and all commercial or residential card access systems as well as all security burglar alarm system. The
Product Description: Magnetic Contact sensors can be added to an existing wired Alarm Systems. They are ideal for protecting doors, windows and patio doors and any opening device such
Specification 1). Main Panel Unit/Alarm host • Support Sensors Q’ty: 99pcs sensors ,Total 99 wireless defence Zones, built-in back up battery inside of panel. • Working Ways: Telephone Line