Appliances are old news, but ones that plug into computers via USB are relatively new. As computers continue to be prevalent in our lives and people work longer hours, the number of time-saving convenience devices that plug into our PC will increase.

Check out some of the more unusual of these USB appliances below, from plug-in pregnancy tests to computer-controlled desk cannons.

Implications - With computers not-so-gradually replacing humans in terms of providable services, it seems everything comes equipped with a USB port. From USB coffee machines to pregnancy tests to vacuum cleaners, universal USB ports stress the modern emphasis on convenience and "all-in-one" devices that are easy to control.