Description: Our third party tested and safety checked dog whistle has a 49cm cord and cover, adjustable frequency and frequency lock to stop barking and teach you callbacks and tricks - No doubt about it , your dog's whistle will stop barking, teach you callbacks and tricks: Yes, we've developed a better dog whistle that will stop barking and help train your dog. Higher frequency means better results for all dogs of any age ADJUSTABLE FREQUENCY + FREQUENCY LOCKED: Yes, our dog whistles have a higher frequency. Patented precision grinding produces a finer frequency range, which is why it features frequency locking so you never lose your dog's perfect tone. Choose a better eco-friendly dog whistle: Yes, we care about quality and the environment. Package includes: 1 x WhistleNote: 1. Please allow a little error due to manual measurement. Please make sure you don't mind before bidding. 2. Color may vary due to different monitors, please understand. Note: Hello, please pay attention to your delivery address when purchasing products. If your delivery information (such as name, street, house number, doorbell/mailbox without name, etc.) is incorrect, the order will not be delivered correctly.)