My sister lives in a maisonette and uses a stairlift as she is disabled. She needs to have a door entry system (not to open the door) so that she can find out who is at the door before making her way down the stairs via the lift. I have seen one on Amazon for £59.95 called a Response and wonder if anyone knows anything about this equipment. They also sell them at Maplin on line and a different type in the stores for £84. There isn't much difference between the two as far as I can see apart from the distance the signal can go. Response Electronics Wireless DECT Telephone and Door Intercom Combination | Maplin Has anyone any comments about this equipment?