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 pinout. About USB. Sockets Universal Serial Bus (USB) are intended for connection to a computer of such external peripheral devices, as the mouse, the keyboard, a portable hard disk, the digital chamber, VoIP-phone (Skype) or the printer. Theoretically, it is possible to connect to one host-controller USB of about 127 devices.