How to get device manufacturer and model in windows store apps

gistfile1.js

var propertiesToRetrieve = ["System.Devices.ModelName", "System.Devices.Manufacturer"];

var pnp = Windows.Devices.Enumeration.Pnp;
var deviceContainer = pnp.PnpObjectType.deviceContainer;

var ROOT_DEVICE_ID = '{00000000-0000-0000-FFFF-FFFFFFFFFFFF}';

pnp.PnpObject.findAllAsync(deviceContainer, propertiesToRetrieve)
.then(function (devinfoCollection) {
    for (var i = 0; i < devinfoCollection.length; i++) {
        if (devinfoCollection[i].id == ROOT_DEVICE_ID) {
            console.log(JSON.stringify(devinfoCollection[i].properties));
        }
    }
});