• Ideal for dogs of all sizes: Emits a high-frequency sound that is effective for dogs of any size within the auditory range. • Versatile and water-resistant: Can be attached to door or window frames, or placed on a shelf or table. • Expandable coverage: Each unit detects barking at a distance of up to 7.62 meters, allowing additional units to cover multiple rooms. • Recommended for homes with a single dog: The unit is standalone and can correct all dogs within the auditory range. • Includes batteries: Operates with 2 CR-2032 3-volt batteries. • Product dimensions: Width 5.7 cm, Height 19.6 cm, Length 14.1 cm. • Product weight: 0.176 kg.