Always think from your dog's perspective in different phase: 1. How to make traning easier: 1.1 A bigger funnel to recharge a ball easier; 1.2 Trainer mode may help in the initial training, the trainer decides when the ball is ready to shot. 2. How to help our dog from any possible cry on ball being stuck inside the launcher. Millions of shot tests, we found the dog launcher has a critical issue as a petself play toy that our dog will cry at a ball/wet ball/ saliva being stuck inside the launcher. WHAT IDOGMATE SOLVE THE CRITICAL ISSUE: 2.1 Arc design matching the balls with durable teeth to maximize the friction; 2.2 Secondly-formed wheel: the traditional wheel will have the hub and wheel rubber seperately, so that these two parts will be seperated by high speed centrifugal force, so that the two wheels distance will be shortened a lot as it were to permit a ball passby, idogmate make the hub and the wheel rubber as a whole entity by secondly-formed technology against high speed centrifugal force. 2.3 Extra ball pusher Extra ball pusher simulates a hand Impulses a ball with enough power to the high-speed wheels, to make sure the ball could be shot out. By the way we also consider How to help our family to save money, Dual power with rechargeable batteries included, and optional durable& washable for long-time chew and play. iDogmate is a team to find a concern, and analysize carefully, solve it for our customer with heart to keep improve our customer use experience. We love our dog(s).Always think from your dog's perspective. iDogmate team