A gas turbine engine hollow turbine airfoil having pressure and suction sidewalls extending chordwise between leading and the trailing edges. Heat may be provided to a portion of the formation. Thus, it is possible to obtain the loop-shaped conductive path having an initially intended design without being damaged during a process. Upon obtaining the user permission to capture the ultrasound-encoded product information, the device receives, from the ultrasound transmitter, an ultrasonic signal encoded with a message containing respective information associated with a respective product.