Input: pure tone, warble tone ±5%, 5Hz Sine wave frequency modulation. 
Masking: Both air conduction and bone conduction can do masking 
Computer Interface: USB data transfer interface, can transfer data to computer, and also can set up personalized print reports. 
Output : Air conduction earphone(L/R), Bone conduction earphone(L/R), Insert earphone, Insert masking. 
Transducer : TDH 39 earphone (standard configuration) 
B71 bone conduction earphone (standard configuration)
 
Remark: 1430