The telephone receiver can be placed anywhere in the home, upstairs or down. When a caller rings the bell you can talk to them without having to answer the door. Ideal security for the old and infirm or for large houses. Screens out nuisance callers. Complete with fitted 7.6m (25ft) line, LED power light, no wiring or electrician needed. Runs for up to 12 months on 4 x AA batteries (not supplied).