The hand held unit is called ": The Cute Dog" AD-100 training dog machine. Wife bought it on Ebay so you may be able to google it.
How it works :- "pulse under frequency conversion, generating 150dB super ultrasonic and 2800mcd strong white light, which can activate visual and additive activation to dog, cat and other animals, while no effective for people."
Use :- "...can be used for banishing virulent dog, cat and so on."
Instructions include :- "Driving the dog: When you meet ferocious dogs, just turn the function change switch to last grade, and aim at the ferocious dogs, and then press the BEAM button, the dog will feel terrified and get away immediately."
Training tips :- On the basis of traditional training methods , here are some mysterious tips of advanced ultrasonic , which are executed by "cute dog" , such a small machine can offer you twice the result with the half effort."
There is a whole lot more but you get the idea.
Border River Pet Resort