The Dogtra Pathfinder brings GPS and e-collar technology right to your smartphone, giving you a more intelligent and responsive way to track and train your dogs. The Pathfinder truly works without using cellular data. Just download the free maps and operate your smartphone in offline map mode. Unlike other GPS e-collars, there are no extra navigation packages to purchase. You have access to terrain and satellite views with the ability to track up to 21 dogs or hunters, share locations, playback data and create customizable geo-fence alerts. With an incredibly fast two-second update rate and a powerful zoom capability, the Pathfinder tracking feature provides greater live-action detail and accuracy when you €™re in the field. Designed to meet Dogtra €™s legendary standard for quality, Pathfinder is for serious dog trainers and owners who demand the most in working, hunting and competitive situations. nFeatures 2 second GPS update rate, tracking only mode, Low to High power stimulation, Rheostat/Slider dial with stimulation levels 1-100, Nick, Constant, and Audible Tone, For dogs 35 lbs and over, Fully waterproof, and 3.5 Hour rapid charge batteries. nTranseceiver Weight and Dimensions Transeceiver Dimensions 2.9 X 1.7 X 1.3, Transeceiver Weight 4.3 oz., Transeceiver and Collar Strap Weight 10 oz., Collar Strap with Transceiver 1 X 28. nWhat's in the Box 1 GPS Connector, 1 GPS Transeceiver, 1 X 28 € Orange Collar Strap, 5/8 € Contact Points, Belt Clip, Carrying Case, Contact Point Extension Kit and Removal Tool, Non-Stimulation Contact Point Covers, Universal Battery Charger 110v/ 220v/ 240v , and Splitter Cable. Features n 9 mile rangen Track Up to 21 dogs or huntersn Uses Google Maps on your smartphone; no data usage required to operaten Geo-Fence with alert options for custom boundariesn Offline Mapsn Location sharing for dogs and dog ownersn Free Downloadable App for Andriod and iOS