There is disclosed a mobile device comprising a sensor, a memory and a processor. The electrical box includes electrical receptacles and is pivotally movable between a retracted configuration in which the receptacles are not accessible and an extended configuration in which the receptacles are accessible. The crypto processor is configured to encrypt or decrypt, while using a first key, data received via the interface, to encrypt the first key while using a second key stored in the memory, and to output the first key via the interface exclusively in an encrypted form. Also specified are advantageous refinements of the semiconductor body and combinations for incidence angle and wavelength of the pumping radiation source that permit a particularly effective optical pumping process of the quantum wells. The number of picks are reduced after each pick by the player.