Abstract: A small radio transmitter receiver system including a transmitter equipped with a concealed transmitting antenna and a receiver equipped with a concealed receiving antenna, the system using a 1.5V-3V battery to provide the necessary working voltage and providing at least two channels for selection, the transmitter being arranged in movable or fixed type as desired, the transmitting frequency of the transmitter being set within 35 MHz to 2.5 GHz for FM stereo or mono audio radio signal transmission as desired.