The
BT Call Reminder unit will let you see who is calling before you pick up the
phone. It also visually lets you know if theres any messages waiting on the FREE
BT Answer 1571 service with a message on the display and a flashing red LED.
It plugs into your telephone socket and acts a a socket doubler to give you a
further 2 sockets to insall phones.
The display shows you the number of the person calling, so you can decide
whether to pick up the phone or leave it to your answering service.