Features: Package includes a door, a dog clicker, a whistle and a hanging rope. Hanging the doorbell on the doorknob, you can teach dog to touch the doorbell instead of barking or scratching the door. Dog can use the doorbell signal when they have go to outside/ potty/ bathroom. Suitable for small, medium and large dogs. Use the whistle to train your dog, teach your dog commands such as sit, come, recall, stop barking, stay, hands shake and more. The dog clicker can be used to train the dog basic obedience, small trick, and correct the bad behavior. Specification: Color: Black Material: ABS+ stainless steel+ nylon Note: Please allow 1- 3cm ( 0. 4- 1. 18in ) difference due to manual measurement and slight color variation for different display setting. Package Including Package Included: 1* Whistle 1* Doorbell 1* Dog clicker 1* Hanging rope