Designed to go anywhere and handle anything you and your dog can dish out. The H2O Series can take on some of the toughest conditions. And new features make this series one of the most versatile trainer collars you can find! Features: - Nick Stimulation - Constant Stimulation - 1800 Yard (1 Mile) Range - 16 Levels of Intensity adjusted from the Transmitter - Digital Technology to Maximize Power - Maxx-Range Internal Collar Antenna System - Gentle Touch System Extra Mild Stimulation - Built-In Safety Shut-Off - Rechargeable Ni-MH Battery System - Completely Waterproof Transmitters and Collars - Positive Vibration System Includes: - Transmitter - Reciever Collar - Battery Charger Splitter Cable - Test Light - Hard Carrying Case Two Dog System