1 Echocardiography (echo) is a painless test that uses sound waves to create pictures of your heart.  This test gives your doctor information about the size and shape of your heart and how well your heart's chambers and valves are working.
USB was designed to standardize the connection of computer peripherals (including keyboards, pointing devices, digital cameras, printers, portable media players, disk drives and network adapters) to personal computers, both to communicate and to supply electric power.
A USB router is a device used for sharing a broadband Internet connection among multiple computers. It is primarily designed for use with cable services where the modem does not have an Ethernet connection. It is also possible to use a USB router for mobile broadband devices. The most common set-up in which a USB router is used is where a home user gets their broadband services from a cable company.