Portable electronic device

A portable electronic device, comprising:

• a main body defining a receiving cavity therein, and comprising four sidewalls surrounding the receiving cavity, a pair of guide grooves defined in two of the four sidewalls at two opposite sides of the receiving cavity, respectively, the camera module fixedly received in the receiving cavity and the movable lens slidably engaged in the guide grooves;
• a camera module received in the receiving cavity of the main body, the camera module comprising a casing and a wide-angle lens unit received in the casing;
• a movable lens received in the receiving cavity and spaced a distance from the camera module, the movable lens being movable between a first position where the wide-angle lens unit is covered by and optically aligned with the movable lens, thereby the movable lens and the wide-angle lens unit cooperatively constituting a telephoto lens, and a second position where the wide-angle lens unit is misaligned with the movable lens and exposed to an exterior;
• and
• a holding member comprising a button and a post extending outwardly from the button, the main body defining a through hole adjacent to the receiving cavity through which the post of the holding member extends, the through hole communicating with one of the guide grooves, and the holding member movable along the through hole toward or away from the guide groove.