The use of any micro-mechanical component in an ultrasound system is disclosed. In one embodiment, a system includes: an RFID reader having a plurality of reader antennas of different polarizations to transmit radio frequency signals; and at least one RFID tag. The front end includes a packet processor to create an aggregate transport stream in a single format from the plurality of transport streams. The duct inner portion has a plurality of discharge holes to allow the exhaust gas to be injected into the duct therethrough and discharged to the outside together with the exhaust wind. , integrated, AED models, a manufacturer can reduce the cost and complexity of its manufacturing process.