Product Requirements:<br> The smartphone or tablet able to run iOS 9 or higher; Android 4.4 or higher.<br> <br> Features:<br> Real-time Status - Monitor the real-time state of door via YoLink App. <br> Open Remind - Remind you while the door is open for a set up time. <br> Battery Status - Update battery level and send low battery alert. <br> YoLink Control - Trigger an action of certain YoLink devices without internet. <br> Automation - Set up rules for “If this then that” function.<br> <br> Specifications:<br> YoLink Hub<br> Input: 5V DC<br> Maximum Current: 1A<br> Working Temperature: -20°C~50°C (-4°F~104°F) <br> Humidity: 0~90% non-condensing<br> <br> YoLink Door Sensor<br> Button: Set Button<br> Voltage: 3V DC (2* AAA battery)<br> Trigger Distance: 18-25mm<br> Environment: <br> Operating Temperature: 0°C~40°C (32°F~104°F) <br> Storage Temperature: -20°C~70°C (-4°F ~158°F) <br> Operating Humidity: 10%~90% (non-condensing) <br> Storage Humidity: 5%~90% (non-condensing)<br> <br> Package Content: <br> 1 x YoLink Hub<br> 4 x YoLink Door Sensor