Ultrasonic Diagnostic Tool KitThe Wrth Ultrasonic Diagnostic Tool Kit features advanced sound detection technology that allows it to convert and amplify inaudible ultrasonic sounds into audible natural sounds. Gives every technician the ability to quickly and effectively diagnose leaks and defects before they become a major issue! Kit Includes: Ultrasonic Receiver Ultrasonic Emitter Hollow Air Probe Contact Probe Headphones Instruction Manual 2 x D Batteries for Receiver 1 x 9V