Yu-Packet Post Easy Shipping Recommended for all breeds and 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, perfect for preventing barking.