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uid: input-system-add-custom-device-command
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# Add a custom device command

To create custom Device commands (for example, to support some functionality for a specific HID), create a `struct` that contains all the data to be sent to the Device, and add a [`typeStatic`](xref:UnityEngine.InputSystem.LowLevel.IInputDeviceCommandInfo) property to make that struct implement the [`IInputDeviceCommandInfo`](xref:UnityEngine.InputSystem.LowLevel.IInputDeviceCommandInfo) interface. To send data to a HID, this property should return `"HIDO"`.

You can then create an instance of this struct and populate all its fields, then use [`InputDevice.ExecuteCommand<TCommand>`](xref:UnityEngine.InputSystem.InputDevice) to send it to the Device. The data layout of the struct must match the native representation of the data as the device interprets it.