Product Requirements:<br> The smartphone or tablet able to run iOS 9 or higher; Android 4.4 or higher.<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 Water Leak Sensor<br> Product Model: YS7903-UC<br> Voltage: 3V DC (2* AAA battery)<br> Working Temperature: 0°C~50°C (32°F~122°F) <br> Working Humidity: ≤100%RH (non-condensing) <br> <br> Package Content: <br> 1 x YoLink Hub<br> 4 x YoLink Smart Water Leak Sensor