Description:This set of magnetic sensor detector includes the wired part and the mating part, which is great for installed on doors of house, garage, warehouse, enterprise and shop etc. Keep your home safe with this set of door security accessories.Features:This is a set of magnetic detecting switch used to protect doors and windows for the most part. Protective device monitors the opening and closure of doors and windows. High quality magnetic sensor contacts with strong magnetic, sensitive respond and long durability. The wired part often be installed on the fixed door frame and the mating part is mounted at the corresponding place on the door. Easy to install and use. A good replacement for the old contacts. Simple to install no hassles. Specifications:Condition: 100% Brand NewMaterial: Aluminum alloyColor: As Picture ShownSize(L x W x H): Approx. 106 x 38 x 10mm/4.2 x 1.5 x 0.4inRated Voltage: 12VRated Current: 120mASensing Distance: Within 50mm / 1.9inPackage Included:1 x Set of Magnetic Detecting ContactsNote:Can not used alone. Should work with the alarm system main unit for alarming..