what is this remote dog training system for ? This dog training tool that is durable, dependable, and designed for the most demanding conditions. This system is the unit of choice for serious amateurs and award-winning professional trainers in pet obedience, hunting, competition trials. This remote training collar should be used only in a humane manner to train and educate your dog. Main Feature 1. Range in open field up to 2000 meters. 2.Highlight LED function can find pet from 200~300 meters away at night 3.- Train up to 2 dogs from the same transmitter. 4. - 99 levels each of static shock, momentary and continuous shock 5.- “Beep” sound activated with a separate button. 6.- Vibration activated with a separate button. 7. - Rotation switch allow you to set your intensity 8. Dog selection button allow you to select your dog. 9.LED display for shock levels& training mode & dog ID&Battery level 10. Memorize shock level in transmitter for different dogs. 11.Easy to operate with rubber button. 12. - Waterproof transmitter and receiver. Dogs can swim freely. 13. - Rechargeable 3.7V Li-ion battery for transmitter and receiver. 14. - LED low power indication, red light will flash when battery level is low. 15. - Full functional multi-dog training system. 16. - Around 8 seconds safe static shock protection. 17. - Comes with warranty.