DOGTRA 3502X E-COLLAR The Dogtra 3502X is designed for advanced handlers. It comes packaged with a professional grade Dual Dial transmitter and an IPX9K certified waterproof receiver. Features a 1.5-mile range, stimulation level lock, single-button nick/constant stimulation, HPP vibration, audible tone, 8-level selector dial, and expandable dual dial for independent control of 2 dogs. The expandable Dual Dial transmitter of the 3502X comes with a dimmable OLED screen and two sets of the Selector Dial and buttons dedicated to each collar. The 3502X is an ideal solution for hunting/competition performance as well as law enforcement use.