Dogtra T&B Dual Transmitter is the proper way to control a 2-dog system, and it gives you the ability to accurately track, detect, and monitor a duo of dogs while they're training or on the hunt. This tough, fully waterproof transmitter boasts a 1.5-mile signal range. Made for dogs as small as 35 lbs., the Dogtra T&B Dual Transmitter features low and high-power stimulation. Dog training stimulation modes include Nick, Constant, and High-Performance Pager (which emits a strong vibration to get your dog's attention). Rheostat dial for Nick and Constant turns 0 to 127 in intensity to match your dog's temperament or the immediate situation. Replacement transmitter for Dogtra T&B Dual (not included).Manufacturer model #: T&B DUAL ADDITI. Replacement transmitter for Dogtra T&B Dual (not included) Dogtra transmitter accurately tracks, detects, and monitors 2 dogs Boasts a 1.5-mile signal range Modes: Nick, Constant, and High-Performance Pager Low and high-power stimulation Rheostat dial turns from 0 to 127 in intensity