Get the extra coverage you need with the Stay & Play Compact Wireless Fence Extra Transmitter to create a bigger play area for your dog.Use this extra transmitter with your current compatible wireless fence system to create an additional 3/4-acre circular boundary area. An LCD display on the transmitter shows you the diameter of the boundary area making it easily adjustable. The LCD display also has warning indicators to tell you if there is an error with your dogs fence. This extra wireless fence transmitter is portable too. Pack this extra transmitter when you and your dog go camping in the RV, or bring it to the vacation rental, so your dog has a safe place to play wherever you travel together. Just make sure you place the transmitter indoors and have an outlet nearby for the transmitter. Youll want to pack some training flags, too, so your dog can learn the boundary area at your vacation destination. This kit doesnt come with an extra receiver collar, so make sure every pet in your family has their own compatible collar before heading out to play. The Stay & Play Compact Wireless Fence Extra Transmitter works with your existing Stay & Play Compact Wireless Fence, Stay & Play Wireless Fence for Stubborn Dogs, Stay & Play Wireless Fence with Replaceable Battery Collar or Wireless Pet Containment System. Your pet deserves the best. Trust PetSafe to keep your pet healthy, safe and happy.