Smallest-Sized Transmitter: Our smallest and most compact transmitter conveniently sits on tabletops or countertops inside your home Expand Your Coverage: Create an additional circular-shaped wireless boundary up to 3/4-acre (22-105 ft in diameter) to your existing PetSafe Wireless Fence Most Accurate Wireless Fence: Our proprietary circular boundary gently guides your dog back to the play area Compatible with All Petsafe Wireless Fences: Stay & Play Compact Wireless Fence, Stay & Play Wireless Fence for Stubborn Dogs, Stay & Play Wireless Fence with Replaceable Battery Collar or the Wireless Pet Containment System Trust The Best: Our proprietary circular boundary gently guides your dog back to his play area Portable: Take this compact, portable fence with you when you and your dog go camping or travel in your RV (outlet required) Lcd Display: The easy to read display shows you how far your pet’s play area expands; the screen also has warning indicators to let you know if there is an error with the wireless fence system Simple Set-Up: With no digging or wire to bury, set up takes just a few hours