Mobile Signal Booster (also known as Mobile Signal Repeater) is a plug and play device that helps in improving mobile signal strength, voice quality and network at your home, office or basement. It is primarily made of 3 components: outdoor antenna, amplifier or repeater and indoor antenna. The outdoor antenna is generally placed at the roof or outside your home or office. It transmits a signal to an amplifier which amplifies the signal and sends it to the internal antenna, which broadcasts it to the area where the signal is weak. In other words, Mobile Signal Booster amplifies the signal outside your home and rebroadcasts it to an area where there is weak or no network.