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 port is a connection point on computers and many other types of consumer electronics that supports network data transfer and battery charging. A USB port is a connection point on computers and many other types of consumer electronics that supports network data transfer and battery charging. Menu Lifewire