PEACE OF MIND - Simple remote trainer with 3 training modes and 24 training levels. Safety Level Lock, Boost Correction, Vibration, and clear LCD screen. Safe, effective, reliable e-collar dog training & behavior aid for positive reinforcement. KEEP IT SIMPLE - Big LCD Screen to display settings, and big main correction button. Perfect tool for all dog owners, entry level and professional trainers. OFF LEASH ON CUE - Built in Carabiner hook to clip to your leash, belt loop, or lanyard. 400 yard range to train in back yards and parks. Great for off leash dog walks and hikes. EVERY DOG IS UNIQUE - Perfect for small, medium, and large dogs 10 lbs. and up. Plastic contact points for dogs with sensitive skin. Convertible collar designed to fit all dogs’ neck sizes. TRAIN UP TO 3 DOGS - Expandable up to 3 dogs with additional collars. Each waterproof receiver can have a custom training mode and memorized training levels tailored for each dog. *Remote Transmitter not included.