This is a three dog unit that comes complete with all three collars, charger, remote, case, interchangeable plugs, waterproof. Collar has never been out of it's case. It has 18 levels of stimulation, vibrate and tone. This system as it sits retails for 850.00. We need 550.00 and it is yours. For more info you can contact me at 605-395-7799 or email me at [email protected]