The Sportdog SportHunter 825X Grey Dog training collar is a versatile tool for hunters and dog trainers. Its compact design makes it easy to use in the field, while its range of up to 1/2 mile allows for effective communication with your dog. This e-collar is designed for dogs 8 pounds or larger with neck sizes between 5 and 22 inches. The Sportdog SportHunter 825X features a range of functions, including tone, vibration, and static stimulation. With fast shipping, you can get started with training your dog right away.Key Benefits and Features: Range: up to 1/2 mile Functions: Button, Continuous Static Stimulation, Momentary Static Stimulation, Tone, Vibration Collar size: 5" - 22" Receiver dimensions: 2.60"L X 1.30"W X 1.23"D Remote Transmitter dimensions: 7.00"L X 2.00"W X 1.24"D