Feature: Wale 3.0 Bluetooth Mesh Smart Home Gateway.  APP linkage: Automatically turns off the air conditioner when the window is opened , install the door sensor on the door and set the door sensor linkage infrared sensor to automatically turn off the air conditioner when the window is opened.  More stable create a smart home system.  solution will be more stable than wifi solution , and can connect with many smart home device.  More safe and easy to control smart device on the app.  Gateway transmission via solution , will be more faster between gateway and smart device.     Specification: Output : 5V / 1A;  Working temperature : -10°C-55°C;  Dimensions : 70 x 70 x 20mm;  Wireless : 3.0;     Note: Why need gateway? There are sensors and detectors can not work without gateway . Gateway need to connect with wifi router , if you already have gateway , you can purchase our sensor or detector only . The sensor and detector can not work stand alone without gateway.      Package content: Smart gateway x 1