The Dogtra BALL TRAINER PRO is an enhanced, unique dual-function trainer that launches and drops balls. The Dogtra BALL TRAINER PRO can launch one ball at a time, up to 2 feet high, or drop one ball at a time with a faster command response time. With its dual-function and compact size, the BALL TRAINER PRO is an ideal tool for immediate rewarding from a distance for behavior marking and detection training. BALL TRAINER PRO is rechargeable, expandable up to 8 devices per controller, and has a 100-yard range.