Dogtra Remote Release Deluxe Remote Launcher Black Advanced 2 port system so you can run two launchers off one receiver; Material Electronics The dual sound attention getter a realistic duck call for retriever training marked retrieves and the beep sound for locating the launcher in heavy cover during upland work A maximum of 16 launchers can be operated off a single transmitter at a range of one mile End user coding features available Long lasting rechargeable Ni-MH batteries