Take the edge off your high-strung pets with Dogtras Edge RT Expandable. Color-coded receivers (black, blue and green) are compatible with up to three dogs and boast a one-mile range. Low, medium and high buttons on the tubular handheld transmitter make no-look operation super easy. Eight-level selector-style intensity control also has a pager feature. Waterproof transmitter and collar. Powered by two rechargeable lithium-polymer batteries (included). Manufacturers two-year warranty. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Color: Green. Type: Training Collars.