Apple has said that its latest computer operating system, Mavericks, is available free of charge. The California-based company made the announcement Tuesday at an event in San Francisco.

It also unveiled a new line of Macs and iPads ahead of the holiday shopping season. And here are the specs. A thinner and lighter 13-inch MacBook Pro with Retina display, with up to 9 hours of battery life. But coming with a lower price tag of $1,299, $200 cheaper than the previous version.

Apple's iPad Air is also about 20 percent slimmer than the previous generation of tablets, starting at $499. And a new version of the iPad Mini also comes with the high-definition "Retina Display", which will be available later in November starting at $399.