The SportDOG FieldTrainer 425X Training Ecollar Grey is a compact and lightweight device designed for in-the-field training or hunting with close working dogs. Its small size makes it easy to carry, allowing you to focus on your dog's performance without distractions. The remote transmitter is quickly and easily operated, even without looking at it, which is ideal for situations where timing and consistency are crucial. Fast shipping ensures that you can get started with your training sessions as soon as possible. This e-collar features a range of stimulation options, including continuous static stimulation, momentary static stimulation, tone, and vibration.Product Features and Specifications: 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