• Ultrasonic anti-bark device for dogs, automatically detects barking and emits safe and harmless ultrasounds to prevent barking. • Helps create a calm and comfortable environment, promoting the dog's learning and obedience. • 3 adjustable frequency modes: Level I (15-30 kHz) for large dogs or noisy environments, Level II (20 kHz) for medium dogs and quiet environments, Level III (30 kHz) for puppies or dogs sensitive to ultrasound. • Equipped with 4 ultrasonic transmitters for effective coverage up to 10 meters. • Built-in 1800mAh lithium battery, fully charges in 5 hours, lasts 30 to 45 days and up to 3 months in standby mode. • Includes 1 anti-bark device and 1 USB cable for recharging. • Not recommended for dogs under 6 months, over 8 years, with hearing problems or aggressive temperament. • Repeated training and rewards are recommended for optimal results.