For Model 28821xx2 there will be ONE additional handset, charge cradle, belt clip, battery pack and cover than shown above.
NOTE: If a speaker box is included in your package, it replaces one set of a handset, belt clip, battery pack and cover.
For Model 28821xx3 there will be TWO additional handsets, charge cradles, belt clips, battery packs and covers than shown above.
For Model 28821xx4 there will be THREE additional handsets, charge cradles, belt clips, battery packs and covers than shown above.
For Model 28821xx5 there will be FOUR additional handsets, charge cradles, belt clips, battery packs and covers than shown above.
For Model 28821xx6 there will be FIVE additional handsets, charge cradles, belt clips, battery packs and covers than shown above.
Telephone Jack Requirements
To use this phone, you need an RJ11C type modular telephone jack, which might look like the one pictured here, installed in your home. If you don’t have a modular jack, call your local phone company to find out how to get one installed.
Wall plate
Modular telephone 
line jack