The Dogtra Ball Trainer Pro for Dogs is an enhanced, unique dual-function trainer that launches and drops balls. It can launch 1 ball at a time, up to 2' high, or drop 1 ball at a time with a faster command response time. This dog training device is specifically designed to fit the shape of the Dogtra Training Box (not included) It is rechargeable and expandable up to 8 devices per controller. The transmitter and receiver have a 100-yd. signal range. A built-in buckle strap allows for hanging and easy portability. With its dual-function and compact size, this dog trainer from Dogtra is an ideal tool for immediate rewarding from a distance for behavior marking and detection training. Kit includes a transmitter, receiver, belt clip, 2 training balls, and an owner's manual. Dual-function dog training tool that launches and drops balls Launches or drops 1 ball at a time Ejects balls up to 2' high 2-hour rapid recharge battery Up to 8 devices per controller 100-yd. signal range