This palm-sized unit offers options for different levels of use, and:

• features an ultrasound microphone with output jacks for headphones or tape recorder.
   
• operates on one 9V battery and has a frequency range of 10-120 KHz.
  
  
• uses a heterodyne system, but features a digital display for increased accuracy of frequency readings.
  

Please note: Available to U.S. customers only.