Silence unwanted barking with this ultrasonic bark deterrent device. It emits high-frequency sound waves that only dogs can hear, effectively stopping excessive barking without harming them. With three adjustable frequency levels (15kHz, 20kHz, and 30kHz), you can find the optimal setting for your furry friend. The compact design allows for easy placement both indoors and outdoors. Give yourself and your neighbors peace and quiet while humanely training your dog not to bark excessively. Measures 4.5 x 2.5 x 1.5 inches.