Monitor Health & Train: The SportDOG FieldSentinel Remote Trainer is a dog behavior aid that also monitors your dog's heart rate, exertion level, and activity duration in a 1-mile range Durable & Designed for Harsh Terrain: Built for the outdoors with field-ready training gear and durable collar material that withstands water, mud, and rugged use in real hunting environments Training for Multiple Dogs: Use the dog training controller with static, tone, or vibration; you can also support multiple dogs with the purchase of additional collars Built for the Field: SportDOG gear was designed by professionals who demand durable, no-nonsense tools that perform in real-world conditions without fail Trusted by Serious Trainers: Professionals rely on SportDOG for proven performance, consistent control, and expert-backed training guidance that gets results