Three years ago a telephone company in Atlantic City, New Jersey, began offering a telephone receiver with a small electronic sensor attached to it. When leaving home the owner just had to dial a central computer bank number, and the sensor would begin measuring the air for smoke particles and movement.
三年前，美國大西洋城的一家電話公司，將一具小型電子感應器裝置在電話機的話筒上，只要使用人在離開房屋前，按一下中央電腦的電話號碼，讓感應器開始工作，它就不斷偵測屋內空氣中微粒的數量與振動量，並輸入電腦。