BT Synergy Trio cordless answerphone and handsets
4 handsets, 1 main base with answerphone, 3 additional bases, 3 power supplies, 1 telephone cable. Plug the main base into the telephone socket and the other handsets connect to the main base. Note: Handsets need batteries (AAA) and if you want to use all 3 additional bases (so 4 in total) you will need another power supply (very cheap to buy online).