30-Day Money-Back Guarantee: Our 3rd-party tested and safety inspected dog whistle with 49cm lanyard and cover features adjustable frequencies and frequency lock to stop barking, and teach recall and tricks. Please return for a full refund if you're not fully satisfied - no questions asked. Dog Whistle Stops Barking, Teaches Recall and Tricks: Developed to stop barking and help train your dog. More frequencies mean better results for any pooch, at any age. Adjustable Frequency + Frequency Lock: Features more frequencies with proprietary precision grinding for a finer range, includes frequency lock to keep your dog's perfect pitch. Eco-Friendly: Crafted cruelty-free and safety tested with your pet in mind. Try and you'll see, or get your money back with our 30-day money-back guarantee, no questions asked. Color: as shown