Dogtra Remote Dog Trainer 3/4 Mile 2 Dog System - 1900X-2This two dog set features a full 3 4 mile range, BOOST for immediate recall, and XPP vibration for instant attention, youre in control when it counts. The metal protective e collar case acts like armor for your collar, adding extra toughness for the harshest conditions. Plus, the LED light keeps your dog visible in low light environments. Whether you're training in the field or tackling rugged terrain, the 1900X is your go to for durable, no nonsense