Variable frequency technology - 2 modes of use to choose :? -standard frequency ,? - Variable frequency, WWVVPET dog training device can emit the high ultrasonic sound of various frequencies, which can attract the dog’s attention very well. Avoid getting used to listening and stop responding to the ultrasound at a constant standard rate. EASY TO USE AND EFFECTIVE - If the dog is barking or causing harm, simply push and hold directly towards him for 10 seconds or switch to a variable frequency ("? “) if the dog is unresponsive. If the dog responds positively, praise and reward him to help him strengthen his memory. SAFE FOR YOU AND YOUR DOGS - Unlike other electroshock dog training devices, the Ultrasonic Bark Control Device uses the latest ultrasonic technology with frequencies ranging from 25-50kHz. The sound does not affect humans (hearing limit of 20 kHz), but it can easily capture the dog’s attention and stop his bad behavior. Consistent training and appropriate rewards are
