A Dogtra Dog Fence is totally rechargable, totally waterproof and totally made to be tough. Dogtra specializes in products made for the most demanding training conditions. A Dogtra Dog Fence allows your dog the freedom it deserves without the use of an unsightly fence in your yard or the costly expense. With the ability to contain an area up to 40 acres you will be able to accomodate any size yard. Dogtra takes pride on developing products that are user freindly.