A wide angle reflector which can work in conjunction with a wide-angle sensor system for testing the wide angle reflector. It is decided to execute at least one of the single color calibration and the multi-color calibration in accordance with history information of the single color calibration executed by the controlling and then the calibration which has been decided on is executed by the controlling unit. The adjusting member is operable to move the direction-limiting element between the limiting position and the release position. A web player reads a file at the head of the queue and obtains the name and location of the archived file. When the supporting element is at a first position, the supporting element is hidden in the main body, and the electronic component having the first thickness is adapted to be inserted into the slot.