Dimensions: 2.5 cm x 8.5 cm x 13.5 cm. Frequency Range: 20 Khz - 85 Khz. Sound pressure level measured at 0.5 meter 120 db. Power input: 12 V DC 175 ma max. Safety standards: UL, CE. Power consumption: 15 watts. Coverage: 25 ft. radius (1,250 sq. ft./116 sq. m.). 50 ft. power extension cord included. Ideal for use in multiple dog homes, for persistent barking problems, to train puppies not to bark, to keep your dog or the neighbor's dog quiet. Product Features: Bark Free features LED status indicators for ultrasonic and for activation sensitivity. Bark free offers two tone settings: Ultrasonic (only dogs can hear it) and audible (humans can hear it too) frequency settings. Audible test button. Wall-mount bracket for indoor and outdoor use. Bark free provides Water resistant vinyl cover for additional outdoor protection. Bark pick-up" feature responds to sounds made up to 25ft. from units. Basements. Bark Free includes 50 ft. power extension cord. Bark free offers One-year warranty.