The SportDOG Brand FieldTrainer 425X Training Ecollar Grey is designed for in-the-field training or hunting with close working dogs. Its compact size makes it easy to carry, allowing you to focus on your dog's performance without distractions. Consistency and perfect timing are crucial when developing your sporting dog, and this e-collar helps you achieve that. The remote transmitter is quickly and easily operated, even without looking at it, which lets you concentrate on your dog's actions. Fast shipping ensures you can get started with training right away. This e-collar features a range of stimulation options, including continuous static stimulation and momentary static stimulation, as well as tone and vibration.Key Benefits and Features: Receiver size: 2.60"L X 1.30"W 1.23"D Remote Transmitter size: 5.30"L X 1.70"W X 1.00" D Stimulation options: Continuous Static Stimulation, Momentary Static Stimulation, Tone, Vibration