Before you think about where you'd like to set up your boundary, you should begin with charging the receiver collar, so it will be ready to program. To charge the receiver collar, lift the rubber plug, plug the receiver charger into the receiver charge jack on the receiver collar. These are keyed to fit one way, so do not force it in backwards. Plug the receiver collar charger into a standard AC wall outlet. The receiver collar light will glow red when connected properly. The light will turn green when the charge is complete, in about two to three hours. The receiver collar must be fully charged before programming it back.