The 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. For dogs as small as 35 lbs. Non-stim high performance pager 10 intensity levels Persistent bark indicator 2 hour quick charge battery