Introducing ARC-X. Designed 30% slimmer than the 1900X, with Dogtra's proprietary ergo curve that contours naturally to your dog. At just 2.75 oz, it's so light your dog will forget it's there. Advanced XPP vibration, audible tone, and brightest LED. 3/4-mile range, expandable to 3 dogs. Completely waterproof. Training, reimagined.