Yu-Packet Post Easy Shipping Recommended for all breed sizes About this product: 【Latest Anti-Bark Collar】Highly effective and safe design without electric shock. It trains your dog safely with 3 modes: beep, vibration (1-7 levels), and automatic protection. Ideal as an anti-bark collar. 【Smart Dual Sensor】Detects barking at specific frequencies and decibels, preventing malfunctions from other sounds or other dogs' voices. Optimal as an anti-bark collar. 【Long-lasting rechargeable】Can be used for about 20 days with a 2-hour charge. USB charging method, ideal for preventing barking. 【Compatible with a wide range of dog breeds】Suitable for dogs with a neck circumference of 18-54cm and a weight of 2kg-30kg. Anti-barking device that can be used for medium to large dogs.