Tri-Tronics Add A Collar EXP Receiver for 2nd and 3rd dogs will field match to your transmitter easily. Compatible with Tri-Tronics G3 EXP Field and Pro Series, Sport G3 Series, and Sport Junior. May also be used as a replacement receiver for any other Tri-Tronics G2. the EXP Receiver is waterproof and durable. It will last for years of hunting pleasure.