CES opened its doors to attendees on Tuesday, so news conferences gave way to booths and demonstrations, as tens of thousands of technology aficionados from around the world filled the conference and expo center. Here are some things that caught my eye:

1. Moneual Touch Table PC

Waiting to place an order in a cafe can be aggravating and time-consuming. A winner of a 2013 CES Best of Innovations award, Moneual's Touch Table PC eases this pain by allowing patrons to browse a menu and place orders through a 22-inch, 1920 x 1080 pixel, waterproof table top screen.

While waiting to be served, diners can play games and take advantage of Internet connectivity, an experience that can be augmented by USB and microphone and headphone jacks built into the table. It also features a credit card scanner for quick and easy payment.

2. LOOXCIE 2 wearable video camera

Looxcie's hands-free video cameras can transmit in real time over 3G, 4G and Wi-Fi (start at $149.99), with an HD version with built-in Wi-Fi ($329.99). Looxcie offers an array of lenses and mounts, as well as iPhone, Andriod and Facebook apps that allow you to view and share video in real time.

3. Smartphone and tablet water protection

Covers and cases for mobile devices are fairly effective at protecting against being dropped on hard surfaces, but water in all forms in the real enemy. Nanocoating providers DryWired and Liquipel offer invisible solutions — so small they can't even be felt to the touch -- to keep your phone dry and resistant to humidity and other evils like sweat, acid, salt and other corrosive agents.

4. Robots that work

China-based Ecovacs offers a line of "home service robots" that can help make housework, er, fun. Available in the U.S. later this year, the Ecovacs line includes Deebot for cleaning floors; Atmobot for air purity; Winbot for cleaning windows; and Famibot for appliance control, home security, smoke detection and "family companionship."