Tri-Tronics® EXP® Accessories contains all the accessories you need for training multiple dogs on the same transmitter. EXP Receivers are durable, compact and waterproof, easily field-matching to your G3 EXP transmitters. Collars come in a variety of color options to keep dogs separate and ensure they receive the proper correction. Upland G3 Beeper can be used as part of an Upland system or as a freestanding product. The speaker design and electronic and sound technology allows the sound to carry more than 1/4 mile. Includes 4 hunt and 2 point sounds for 8 total combinations. To add an additional dog to your Upland system, order the EXP Receiver & G3 Beeper Combination.