The main base is the central communication for all the handsets, if your main base station is faulty none of your handsets will work.
BT 7660 Cordless Phone Additional Handset 109337 109338 109339 K55-E97
BT 7660 Cordless Phone with Answering Machine K55-E97
BT 7660 Cordless Phone Quad Handsets, Silver/Black with Power Supply
BT 7660 Cordless Phone Handset Only No Charger No Batteries 109338 K55-E97
BT 7660 Cordless Phone Main Base Charger Charging Base K55-E97 109337
Replacement Additional 1-Handset Only (without Base) for BT 7660 Cordless Phone
