The functionality is available now in the US, and companies like Abode, ADT, Honeywell, Ring and Scout Alarm are already using it. It's understandable why you might hesitate to use Alexa support, especially if you're concerned that someone might listen in. Amazon is clearly betting that its own security measures (including user-specific voice recognition) are enough, though, and this could be convenient you'd rather not pull out your phone or walk across the house just to punch in a code.