The Stay & Play Wireless Pet Fence Kit with Replaceable Battery Collar lets you create a secure play area without spending time burying wires and without the high cost of building a physical fence. This transmitter creates a circular, wireless boundary that covers up to a 3/4-acre area. Choose from 5 adjustable levels of static correction to find the right level for your pet, plus a tone-only mode which warns your pet with a beep when they approach the boundary. Includes 50 boundary training flags.