A filling level sensor for a liquid container such as a fuel tank for a motor vehicle includes a lever arm having a first end on which a float is mounted and a second end mounted in a support part. The display panel includes a display substrate, a display device layer, and a thin film encapsulation layer. An integrity check value is generated and stored for the outgoing page. Meanwhile, comparing with the external wireless network accessing devices which has protruding part, this intelligent terminal can prevent the wireless network accessing device from being subjected to external impact and the consequent damage on the interface, so the availability and the reliability of the product in use are greatly improved. while being compressed at a pressure in a range of from 0.