To call a doctor, patients only needed to click the button on little machines. At that time, server would make sound; the electricity lamp lighted up and corresponded to rooms and specific patients.

Computer systems consisted of the server, installed at the watch-rooms of the health officials, and little machines at patient rooms. The machines are larger than lighters, connected wireless (wifi) to the server. Thus, patients can put little machines at their bed, bathroom, and toilet easily. The radius operation of the machine is within 100m, but it is easy to upgrade its operation radius.

The machine is suitable for hospitals, clinics, nursing homes, other health care services,... Biomedical Engineering Department has been seeking partners to transfer this technology, or combining to produce commercial products.