This game is perfect for allowing your dog's brain to become interactive and training themselves to understand the fetch/treat scenario. Note: The ball is rolling out! Not pop up! Features: Safety: This dog toy features multiple motion and safety sensors to detect and protect people or pets; a front motion sensor protects dogs and people standing in front of the launch area. Taking up no space: Easy to place indoors or outdoors, suitable for free corners.Your dog will like it very much. Easy to use: This ball game couldn't be easier to use. The innovative design allows your dog to play this game by themselves, all they need to do is fetch the ball and drop it back into the console to receive a treat. Once the ball is dropped back into the console, it triggers a treat of your choice to be released and the ball will be rolled from the console to start the game all over again! Product size16*16*20cm elastic tennis ball, suitable for pet bites of different ages. Specifications: Color: White/Green Size: 16*16*20cm Material: ABS Type:Reward Machine Dog Size: All Feature: Tennis Ball Fetch Model: Pet Tennis Trainer Package Included: 1 * Pet Tennis Trainer 1 * tennis 1 * use manual Notes: Note: 1.Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) 2.The color of the actual items may slightly different from the listing images due to different computer screen, 3.Thanks for your understanding.