Dogtra Ball Trainer The Dogtra Ball Trainer is a unique dual-function trainer that launches and drops balls, designed for training working dogs. The Dogtra Ball Trainer is expandable up to 8 devices and uses one controller that has a 100-yard range. Its dual-function and compact size makes it adaptable for a variety of training types, ranging from detection training to search and rescue training.|4.9|13.25|10.5|4.5|100-Yard Range|Dropper Holds up to 3 Balls|Launcher Launches up to 5 Feet|Expandable up to 8 BALL TRAINERS|6 AA Batteries for Ball Trainer Receiver|2 AAA Batteries for Handheld Transmitter|Compact Size with Strap for Versatile Usage|false|N/A Manufacturer: Dogtra Model: BALL TRAINER SKU: SI_1113318