Product Features: Your dog's bark automatically triggers corrective ultrasonic bursts to help correct boredom or annoyance barking habits. 2 speakers. Selector switch for ultrasonic or audible settings. Sensitivity selector slide switch adjusts to your dog's barking pitch. Test button Wall mount or built-in standing design. Powered by 50ft. power supply adapter (included) or 4 "D" Batteries (not included) Batteries lasts approximately 2000 sound releases under normal conditions. Twin dual piezo-ceramic transducers. 50 FT. Low-lead cable included. Up to 60 ft radius coverage area.