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This rugged, all-weather collar combines a high-sensitivity GPS receiver and VHF antenna into an all-in-one transmitter that works with the Astro 220 to safeguard against your dog getting lost. Astro DC 40 sports a durable one-inch orange polyurethane collar that fits most e-collar receivers eliminating the need to put two separate collars on a dog. Plus, Collar Lock uses a four-digit PIN number that helps prevent others from seeing your dog's whereabouts. Includes: DC 40 wireless transmitter with collar AC adapter Vehicle power cable Quick start manual