Now you can train 2 dogs at once! The Little Dog Add-A-Dog® Extra Receiver Collar will work with any Deluxe Remote Training System. It programs in seconds and converts your 1-dog system into an easy-to-use 2 dog system. You can also use it as a replacement collar for your 1-dog system. With a range of 350 metres, 15 levels of stimulation and a rechargeable battery, you can train your small dog in style.