... Internal Antenna Door Magnetic Sensor detect the door open.When any entry the door,this magnetic door sensor know it. Name: Wireless Door ContactModel: DM ... protaction unit. It is special for monitoring the door or windows, once the door or windows opened, will activate the DM- ... : (HxWxD) 100x30x26mm. Magnet part: 60X23*10mmApplications: For indoor use. door or windows, etc. Wireless Internal Antenna ...