1.signal including pure tone,pluse voice and warble tone. 2.Should connect the computer. 3.provide 11 AC test frequency point. PC computer interface: USBOperating system: WindowXPDriver:WindowXP own Technical parameters Output:Air conduction/bone conduction Masking; NB/WN/SN/PN Maximun HL air conduction/bone conductin: 110DB/70DB Noise/square wave Attenuation step length: IdB+5dB External Printer ...