If you're installing a NuTone Master Station along with a door speaker, use the NuTone NM Series Rough-In for NM100/NM200 Master Station during installation. Unlike the larger NuTone rough-in kits, this kit only includes the parts needed to mount an NM100 or NM200 Master Station and connect it to the door speaker. KIT INCLUDES: Metal Wall Housing for Master Station, FM Dipole Antenna, AM Antenna Wire (25 ft.) with a Ferrite Filter, NW4S Shielded Door Station Cable (75 ft.), (4) 1.5-inch Snap-In Bushings, Transformer (NA300TA). Tools Required: Power drill with 1" auger, #2 Phillips screwdriver, Wire stripper/cutter, Tape measure, Level. NOTES: 1. The NM200 rough-in installation should be made during new construction prior to drywall installation. 2. Door speaker rough-in parts not included.