SportDOG SportTrainer 575 - Black - The SportDOG Brand SportTrainer 575 is designed for field training and hunting with close-working dogs. Featuring an easy-to-read OLED screen, you can view the selected dog, static stimulation level, and battery status with just a glance. For dogs 8 pounds or larger with neck sizes 5in - 22in Collar Receiver charges in 2 hours, lasts 50-70 hours per charge Remote Transmitter charges in 2 hours, lasts 20-40 hours per charge Expandable to 2 dogs