The Contact Pet Com Companion pet tracking system offers the ability to track a single dog up to range of 3 miles. Contact tracking systems operate on 434-435 MHz to provide the clearest and most accurate signal with significantly less interference than other tracking systems The small, lightweight receiver easily fits into a pants or jacket pocket and operates for up to 15 hours on 2 AA alkaline batteries An easy to view signal indicator provides immediate feedback as to the location of your lost pet Pet Com comes complete with the smallest available collar transmitter, weighing just over 1 oz. to fit comfortably on any size pet