Description:Ultrasonic Pet Anti-Barker Bark Control Stopper Silencer Training Tool Features: Pet Friendly Anti-Barker: This ultrasonic anti-barker works by emitting a steady frequency of sound that only dogs can hear, preventing barking and silencing dogs. There is no irritating smell, no electric shock and the dog anti-barking device only works when the dog barks. The dog repeller is harmless to human and dog hearing and is perfect for creating a quiet sector for dog lovers and discouraging unwanted behaviour. Effective for dogs of all sizes: the Ultrasonic Bark Repeller has 3 adjustable sensitivity and frequency levels (15-30 kHz for large, naughty dogs); 20 kHz for educational dogs; 30 kHz for small dogs) to easily prevent barking in dogs of all sizes. Adjusting the frequency each week will maintain the training effect. Easy to use: this rechargeable bark control with LED indicator can be used effortlessly. The blue light flashes every 6 seconds when you are working on 3 different levels; the red light stays on for 3 seconds when sound barking is triggered; and the red light flashes on low battery. Outdoor and indoor use: The human barking device is IPX4 rainproof and the portable hook can be easily hung from a tree, wall or fence post. However, when it rains heavily, it is best to take it back with you to prolong its life. The ultrasonic dog unit can be placed on tables, walls and shelves over 1.5m in height for more effective adjustment to barking, digging, fighting etc. Colour: Black Size: 85*10*48.5mm Material:ABS Package includes: 1 * Anti-barking device controller Note: 1. Please allow a little error due to manual measurement. Please make sure you don't mind before bidding< br> 2. The color may vary depending on the display. Please understand< br> Note: Hello, please pay attention to your shipping address when purchasing products. If your receiving information (such as name, street, house number, doorbell/email without name) is incorrect, the order will not be delivered correctly.)