A 2-way monitor for a baby that could be used as an invalid calling system. The set comprises a large box with volume control and button for talking, and a smaller box. Both bozes are contect by a long wire. The box reads 'For careful mothers peace of mind. 2-way communication between rooms of pram and house. Mother gets immediate warning that the baby is crying. Baby gets immediate words of comfort from its mother.' The dimensions listed are for the box.