Extreme Dimension Wildlife Calls - Pro Series Upgrade Kit - Upgrade form Pro Series Wired to Wireless Call 200 Yard, 16 function, 3 channel transmitter/receiver module 3 Channels of wireless capability Includes 2 antennas The Phantom Pro-Series Upgrade Kit comes with Transmitter, Belt Clip, 2 Antennas, Receiver Module This Upgrade Kits Gives You 3 Channles of Wireless Capability So You Can Hunt Oin Close Proximity To Others On Separate Channels Can also be used in Multiple Reciever Step-Ups with one Transmitter