This is a used item that has been used for over a year. It was used at home as a nurse call for the elderly, such as when meals were finished. It is for hospitals and nursing homes. The chime continues to ring from the transmitter's call until the receiver's response button is pressed. It does not have a call function. The range is about 20m, and it can easily reach about 3 rooms with 4 doors in between. The batteries are AA, so they are economical. They last for over a year.