Feature●Price For: Each Item: Ultrasonic Leak Detector AC Frequency Response: 36 KHz to 42 KHz Function: Ultrasonic Sound Detection Includes: Headset, Probe, Carry Case, Wave Guide, Battery Country of Origin (subject to change): United StatesDescription Ultrasonic Leak Detector, AC Frequency Response 36 KHz to 42 KHz, Ultrasonic Sound Detection, Includes Headset, Probe, Carry Case, Wave Guide, Battery