the electric fence retractable roller gate is with protected housing box, which is used to quickly install flexible gates or doors.  the polytape or polyrope will be automatically retracted to the protected housing box, which is easily and safety to open or close the fence gate. the mounting parts, screws and the gate handles are included for fast and easily installation. the mounding parts is used to support the retractable roller gate, the screws are used to mount on the wood post, the wire is used to connect the polywire or polytape to the bottom of the retractable roller gate (there is a electric conductor on the bottom of the retractable gate),   when the fence gate is closed by the retractable roller gate, the electric pulse will go through from one side to the other.