An antenna assembly includes a printed circuit board with a first surface and a second surface, a support attached on the first surface of the printed circuit board, and an antenna attached on the support. The lens cap module includes a plurality of leaf pieces, a switch and a gear transmission. The speed control unit controls a transfer speed of the data transfer unit based on a state of a data transfer destination during an operation of the memory. A second distance sensor mounted at a predetermined distance from the first sensor to measure distance to the target location when the second distance sensor is positioned proximate to the target location.