... own patent and private mold HNSAT Digital Recorder with telephone recorder(1)Easy to work.The unit adopts ... ,HP.(3)VAR System Voice Actvated Recording.(4) Record telephone conversations. Record via external microphone.(5) Drive free USB ... of AAA batteries.(16)Accessories: earphone, USB cable, telephone adapter, telephone line, line-in cable,external microphone, Instruction manaul.(17) Battery lifetime ...