Do you want to lock the door with ease and keep your home safer? This Wireless 4CH Multifunctional Relay Module & 4 Button Car Remote Control Kit XY-K4-DC+RD090 will be the best solution for you!The wireless relay module will give you full control over the doors because of its high speed recording. Multifunctional, the wireless relay module is multifunctional, which applies to Home and Store alarm System; Electric motor car, automobile, motorcycle alarm device, each kind of windows and doors controller and other industrial control. Made of high quality material, the 4CH relay module provides super durability, reliable for long time use.Dependable and useful, this is the best home keeper for you, do not miss it!