The YS600 is a high powered no bark collar that is smaller, lighter and more accurate than YS500. The YS600 bark collar features an Advanced Bark Sensor technology which will more accurately detect your dog's barking.
Features:

Waterproof Receiver
Low to High Stimulation
Non-Stim High Performance Pager
Advance Bark Sensor
10 Intensity Levels
Persistent Bark Indicator
For Dogs 35 pounds or larger

2 hour quick charge battery
Includes:
Bark Collar with black 1 x 30 inch collar strap
Rechargeable Li-Po battery
5/8 inch contact points
Rubber contact caps
Wall charger.