Dogtra YS600 Rechargeable Waterproof High-Output No Bark CollarThe YS600 is a high powered no bark collar which includes Superior Advanced Bark Sensor technology sensor that can detect the dog barking as accurately as other Dogtra bark collars. The receiver and collar are fully waterproof. System includes: rechargeable Li Po battery, 5 8 inch contact points, black 1 x 30 inch collar strap, rubber caps and a wall charger. Features: For dogs as small as 35 lbs. Non stim high performance pager 10 intensity levels