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.
USB Data Cables. USB or Universal Serial Bus is a common PC connection standard that lets you attach a variety of peripherals including hard drives, mice, keyboards and media players. USB connectors come in several variations, known as Type A, Type B and so on. You can recognise them by the USB logo (a circle with three arrows coming out of it) that usually appears on the cable. The most common is USB type A: a flat, silver connector terminating in a squat, rectangular face.