Windows devices humaninterfacedevice

Hello, I want to apply this code, with an example. But I can't apply this class because it will show me that I don't have it. What should I do?

using Windows.Devices.Enumeration;
using Windows.Devices.HumanInterfaceDevice;

<pre>using Windows.Devices.Enumeration;
using Windows.Devices.HumanInterfaceDevice;