【Home Security】Protective device monitors the opening and closure of doors and windows.Prevent kids and babies going out the house without notice. Protect your house from thiefs break in your house's windows and doors 【Protect Doors And Windows】This is a set of magnetic detecting switch used to protect doors and windows for the most part. 【High Quality】High quality magnetic sensor contacts with strong magnetic, sensitive respond and long durability. 【Great Customer Service】we provide a 30 days full- return if there is any problem with the product. customer service will be there for you during the day and night 【Easy To Install】Easy to install and use. A good replacement for the old contacts. Simple to install no hassles.The wired part often be installed on the fixed door frame and the mating part is mounted at the corresponding place on the door., Weight: 0.3705088775172 Pounds, Manufacturer: Haofy