I recently fell in the house and my wife didn't hear me call . My mobile phone was in another room ( naturally! ). I thought perhaps she was upstairs but then remembered we live in a bungalow!! She has bought me a referee whistle which she ties round my neck-------tightly if I annoy her! It works very well and she feels much happier as she is slightly deaf ( I didn't say that )
Word of warning DONT use too often or you may be told to GO &. WHISTLE
Best wishes. Ted