Stay & Play Wireless Fence With Replaceable Battery Collar - Giving your dog a fenced-inplayarea doesn't have to be expensive or complicated. The Stay & Play(R) Wireless Fence 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,wirelessboundary that covers up to a 3/4-acre area.What makes this fence great is thatsinceit'swirelessyou can take it with you anywhere.Pack it inyour RV when you take the whole family camping or bring it to the vacation rental for a long weekend to give your best friend a secure place to play wherever you go together. This wireless fence kit comes with awaterproof, battery-operatedreceivercollarthat is ergonomically designed to be comfortable for your pet to wear. 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.This fence works with an unlimited number of receiver collarswhich means thatyoucanpurchase additional collars for every dog or cat in your family. Circular boundary adjusts to cover a 3/4-acre yard (5-105 ft in all directions) Sets up in 1-2 hours Portable for when you travel (outlet required) Tone-only mode and 5 levels of adjustable static correction Waterproof collaradjusts to fit neck sizes 6-28 in Purchase additional receiver collars forall ofyour pets Receiver collar requires 1 RFA-67 battery, included Battery lasts about 1-2 months depending on how often you usethe collar