At one Las Vegas hotel, this pair will bring snacks, drinks and more to your room. If they seem robotic, it's because they are.

But when it comes to coffee and amenities, they're at the ready. Here's how it works: After receiving a guest request, a human employee loads items into the robot's compartment, then inputs the guest's room number and hits the robot's "Go" button. The robots have tamper-proof lids to prevent items from being removed before they reach their destination.