Regal Hound Designs 1.5" wide Martingale Dog Collar, Lined, 2 Sizes: Medium, Large/XL, Pink Strawberries Design (Medium 13-18") NEW QUALCOMM MICROPROCESSOR CONTROLLED BARK DETECTION - a break-through technology and innovative upgrades were implemented in the new version of No Bark collar featuring the newest Intelligent Anti-Injury Chip. The collar has 5 levels of adjustable sensitivity and 3 training modes - beep, vibration, and gentle, safe shock (no shock mode is an option as well), effectively stopping the barking with no harm to the dogs of all types.