The Dogtra 3500X is designed for advanced handlers, packaged with a professional grade DUAL DIAL transmitter and IPX9K certified waterproof receiver. Geared towards professionals, the unique and essential features are intended to elevate your training regimen: 1.5-mile range, Stimulation Level Lock, single-button Nick and Constant stimulation, HPP vibration, audible tone, 8-level Selector Dial, and expandable DUAL DIAL for independent 2-dog control. The expandable DUAL DIAL transmitter of the 3500X comes with a dimmable OLED screen and two sets of the Selector Dial and buttons dedicated to each collar, which allows seamless and effective operation of the collars without switching levels back and forth. The 3500X features make it an ideal tool for elevating hunting/competition performance or training tactical K-9 operation. The range may reduce depending on the surroundings. The transmitter is 4.40 in x 4.90 in x 1.50 in and the receiver is 3.50 in x 1.40 in x 1.30 in.