This rugged all-weather collar has an integrated GPS transmitter and antenna that work with the Astro® 220 to ensure that your dog will never be lost again. Plus it's specially weighted so the antenna will always point to the sky for optimal signal.Attach Collar and Go When teamed up with the Astro 153; 220 this system will have you hunting in no time. The DC 30 in combination with the Astro 220 pinpoints your dog's position every 5 seconds and runs for 17 hours. You can extend the battery life of the DC 30 by changing the position transmit rate from 5 to 10 or 30 seconds enabling the DC 30 to work up to 36 hours in the field on one charge. You will know if your dog is pointing sitting moving or treeing. Where it's at. Where it's been. How fast it's moving and how far it's gone.Features include: High-sensitivity GPS receiver Dog position updates every 5 10 or 30 seconds Seven mile range depending on terrain Rugged IPX7 waterproof design 17 to 36 hour battery life rechargeble lithium ion Maintains position on top of dog's back Made of durable material Convenient comfortable easy-to-use Product : GARMIN DC-30 TRANSMITTER COLLAR FOR ASTRO Manufacturer : GARMIN PARTS Manufacturer Part No: 010-11049-00 UPC: 753759080167