I want to change a property of a SharePoint list item with given input. I used the documentation and got this, but I'm not sure what I'm doing wrong. There could be something completely wrong because I'm not too experienced.

```
$().SPServices(
        {
            operation: "UpdateListItems",
            async: false,
            listName: "TechInv",
            Number: itemNumber,
            valuepairs: [[property, replacement]],
            completefunc: function(xData, Status) {
                // ...
            }
     });

```