A wireless wideband device comprising a main body and a terminal cover. The main body and the terminal cover fit together to form a whole. A first battery is disposed in the main body to supply power to the main body circuit, enabling the main body to achieve wireless wideband functionality. A second terminal battery is arranged in the terminal cover. Power source output flat springs of the second battery protrude from the inner face of the terminal cover. The inner face of the terminal cover is in contact with the main body. The power source output flat springs of the second battery are in contact with the exposed power source input contact points of the main body circuit. When the output voltage of the first battery is less than the minimum voltage required for the main body circuit, the main body circuit switches over to the second battery for power. The wireless wideband device has a long-lasting power supply, which makes for a good user experience.
