Get your dog's attention with the PetSafe Collarless Trainer, an ultrasonic handheld training device that emits a high-pitched sound only dogs can hear. Correct unwanted behaviors like excessive barking, backyard digging or jumping on guests with the touch of a button. With four working modes and 2 frequency types, the PetSafe Collarless Trainer is a contact-free training tool recommended by both dog trainers and veterinarians.