Extra collar/receiver for EDGE system Expand your Dogtra EDGE to a 2-dog, 3-dog or 4-dog system with this extra collar/receiver. This unit can also be used to replace a lost receiver. Equipped with high intensity LED location lights, you are able to easily find and distinguish between dogs in low-light/dark conditions. Light options are white, red, blue and green. These “location light” colors correspond to the button colors on the handheld transmitter. Fully waterproof. The 2-hour rapid charge Lithium Polymer batteries are housed in a separate compartment for easy replacement. The standard 5/8″ contact points can be extended to 3/4″ for use with dogs with longer coats. Choose Orange, Green, Blue, or Black. Features 1-mile range Nick/Constant/Non-stimulating Pager vibration modes Location light with 4 selectable colors (white, red, blue, and green) User expandable to 2, 3, or 4-dog system Replaceable batteries Fully Waterproof Extendable contact points – Comes with standard 5/8″ contact points (can be extended to 3/4″ for dogs with longer coats) 2-hour rapid charge 2-year warranty