K-9 BSD 3 Ball Launcher – Remote Ball Reward Launcher for DogsTo vary the height of the ejection of the reward, use different weight rewards. For example: tennis ball ejects 10 feet hollow rubber ball ejects 4 feet large Kong ejects 2 feet (must be inserted upside down). solid rubber ball ejects 2 feet When the BSD 3 Ball Launcher unit is cocked , it is turned on and draining the batteries. Do not store or leave the unit cocked for long periods of time or it will run the batteries down. The K 9 BSD 3 Ball