PUPT 100 19 Collarless Ultra Sonic Trainer Handheld ultrasonic remote trainer uses an ultrasonic tone for correcting unwanted behaviour and uses a positive tone for rewarding good behaviour. No receiver collar required to put on the dog. www.innotek.com.au
From www.petsafe.net – An overview of the PetSafe collarless ultrasonic remote dog trainer. When the system emits its ultrasonic sound, your furry friend will understand that you want him to stop whatever he is doing. The system also has a positive tone to reward good behaviors as well as a negative tone to counter undesirable ones.
