Educational Dog Accessories -Pet Dog Bark Controller Highlights Generic Brand Pet Dog Bark Controller Description: Suitable for all sizes of dogs - this dark dog repeller uses ultrasonic sound that works effectively to reduce dog excessive bark up to 150m/492ft, but out of human hearing range; 100% animal and human safe. WEATHERPROOF and READY TO - Durable construction approved for indoor or outdoor use and designed with mounting provisions for easy installation. 3 Level Sensitivity: It depends on the range of the barking dog, you can choose to set it to low sensitivity (up to 15 feet) / medium sensitivity (up to 30 feet) / high sensitivity (up to 50 feet ); SLEEK & STYLISH - Effective AND adorable. The black color allows it to completely blend in with outdoor settings instead of standing out and showing dirt and discoloration! Material: plastic, size: approx. 10x6.7x11cm/3.94x2.64x4.33inch, power supply: 9V battery (not included) Package includes: 1 piece dog trainer Note: Due to manual measurement and lighting effects, there is a slight difference between the size and color of the above and the actual item.