SURFOU Door Chime Door Sensor Chime with Adjustable Volume 1000ft Range 55 Chimes Mute Mode LED Indicators Easy Installation Door Open Chime for Business Home When Entering,White 1 Receiver+1 Sensor June_2023_update These 3 way wire connectors industrial_Aug2024_update These 3 way wire connectors take care of all the connections with ease and keep everything clean and easy to manage LED Display Vehicle Voltmeter We engineered this car charger with the voltmeter to keep you informed of the car’s health [Easy Installation] Simply plug the receiver into the socket and attach the transmitter to the front door with the included double sided tape or screws and you're ready to use door sensor will automatically trigger the receiver when the two part of ransmitter is separated and the receiver will alerts immediately whenever the door or window is opened