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The Elite Big Dog Add-A-Dog Collar will work with any Elite 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 original system. With a range of 1,000 yards (900 m), 15 levels of correction, and a rechargeable battery, you can train your large dog in style. For dogs over 18kg.