The SportDOG Brand(R) Launcher Receiver can be fitted to most brands of bird launchers or throwers and also works with our Launcher Basket. The system can be used to train retrievers to remain steady and mark falling birds. It can also be used in pointing dog training to reinforce steadiness when a bird flushes. To add realism to training situations, the Transmitter can signal the Receiver to emit the sound of a duck quack, pheasant cackle, or shotgun report.Features:SPECIAL FEATURESDuck, pheasant, and shotgun report sounds availableMORE INFORMATIONIn Normal Mode, the Transmitter can control up to 4 Receivers, and each Receiver can control up to 9 devices, using SportDOG(R) cables, for a total of 36 possible devices. In Expanded Mode, the Transmitter can control up to 36 independent Receivers. To add realism to training situations, the Transmitter can signal the Receiver to emit the sound of a duck quack, pheasant cackle, or shotgun report. By altering distances between the Transmitter and Receiver(s) and tailoring the sounds to the training situation, the system provides you countless options for training your dogs for everything from hunting to hunt tests to field trials. Launcher Basket and Transmitter not included.RANGEUp to 1/2 mileEXPANDABLE SYSTEMExpandable to 36 ReceiversWATERPROOFWaterproof and submersibleBATTERIESRechargeable lithium-ion batteryCharges in 2 hours, lasts 80 hours per chargeLOW BATTERY INDICATORYesSYSTEM COMPATIBILITYCompatible with the SportDOG Brand(R) Launcher System (SD-LAUNCHER-KIT)CONTENTSReceiverCharging AdaptorOperating Guide