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2. Dog whistle - Wikipedia

   en.wikipedia.org/wiki/Dog_whistle

   Some dog whistles have adjustable sliders for active control of the frequency produced. Trainers may use the whistle simply to get a dog's attention or to inflict pain for the purpose of behaviour modification. In addition to lung-powered whistles, there are also electronic dog whistle devices that emit ultrasonic sound via piezoelectric ...

3. Ultrasonic transducer - Wikipedia

   en.wikipedia.org/wiki/Ultrasonic_transducer

   A curvilinear array ultrasonic transducer for use in medical ultrasonography Inside construction of a Philips C5-2 128 element curved array ultrasound sensor. Ultrasonic transducers and ultrasonic sensors are devices that generate or sense ultrasound energy. They can be divided into three broad categories: transmitters, receivers and transceivers.

4. BowLingual - Wikipedia

   en.wikipedia.org/wiki/BowLingual

   BowLingual has bow functions which include dog training tips, a "Bow Wow Diary," tips on understanding a dog's body language, a medical checklist and a home alone bark recording function. The device consists of a hand-held receiver that contains a LCD information screen and functions as the controller and a wireless microphone-transmitter which ...

5. Home ultrasound - Wikipedia

   en.wikipedia.org/wiki/Home_ultrasound

   Ultrasound energy is transferred based on the frequency and power output of the ultrasonic waves that an ultrasound machine or device creates. Home ultrasound machines and doctor's office machines both operate between 1 and 5 megahertz, however, home machines utilize pulsed ultrasonic waves while professional ultrasound machines in a doctor's ...

6. Ultrasound - Wikipedia

   en.wikipedia.org/wiki/Ultrasound

   Ultrasound is sound with frequencies greater than 20 kilohertz. [1] This frequency is the approximate upper audible limit of human hearing in healthy young adults. The physical principles of acoustic waves apply to any frequency range, including ultrasound. Ultrasonic devices operate with frequencies from 20 kHz up to several gigahertz.

7. 28 Most Expensive Dog Breeds - AOL

   www.aol.com/28-most-expensive-dog-breeds...

   The real cost of getting a dog is more than just the dog's purchase price -- long-term expenses need to be considered, as well. If you do a little research, you'll find that although there are ...