It was the hottest ticket in town Sunday:

As the doors opened at CES Unveiled, hundreds of reporters, bloggers and those with … let’s just say questionable press credentials … poured into a ballroom at the Mandalay Bay Convention Center for a first look at new products being released at the 2013 International Consumer Electronics Show.

Although the massive show doesn’t officially open at the Las Vegas Convention Center until Tuesday, a slew of manufacturers allowed those with press passes to view new products in advance.

Lenovo’s area of the packed ballroom featured four card tables with the company’s high-powered desktops on them, but what really attracted a shoulder-to-shoulder crowd was Horizon, its new 27-inch table-top PC.

“If you lay it down flat everyone can kind of gather around it,” said Cassidy Weathersby, a Lenovo spokeswoman.

And they did.

Amazingly, two men were able to squeeze between the throngs of bodies and actually play air hockey on the PC, which looks more like a table than a computer.

“I like Horizon because it’s the first of its kind,” Weathersby said.

Lenovo also was showing its Yoga 11 S, an 11-inch Ultrabook that can flip 180 degrees to sit more like a tablet. Or not. Your choice.

Elsewhere, DISH was showing off a second-screen app that allows subscribers to use smartphones and tablets to see what’s on TV and change the channel. Named DISH Explorer, the app is free with a DISH subscription starting today. The app also offers social media interactivity, which is something spokesman Aaron Johnson said is appealing to the masses.

“TV goes from being a passive activity to being an engaging activity,” Johnson said.

So if everyone you know is watching “Here Comes Honey Boo Boo,” the app will recommend that. Then, you can decide if you want to engage in that particular activity.

And in keeping with the hype about Ultra-HD TVs, LG Electronics unveiled its 84-inch version. Released in October, expect 55- and 65-inch models to join LG’s lineup later this year.

Just in case your new iPhone 5 isn’t good enough as-is, some companies showing at the 2013 CES aim to improve on Apple’s technology.

Kubxlab debuted its ampjacket acoustic amplifier case, which it claims will make the iPhone 5 twice as loud. And Dexim Santom USA was showing off its Power Skin, which can double the battery life of your iPhone 5. The phone case has a battery attachment at the bottom that clicks into the handset.

The 2013 International CES, open to trade only, is expected to attract an estimated 156,000 attendees to Las Vegas this week, about the same as last year’s show. More than 3,100 consumer electronics companies will display 20,000 products Tuesday through Friday . Consumer electronics is a $206 billion industry, and the show is estimated to bring a nongaming economic impact of $197.3 million to the city, according to the Las Vegas Convention and Visitors Authority.

Contact reporter Laura Carroll at lcarroll@reviewjournal.com or 702-380-4588. Follow @lscvegas on Twitter.