Abstract: A detector for detecting the removal and/or insertion of a weapon out of and/or into a holster. The detector may transmit a message each time the weapon is removed from the holster. A recording system may receive the message and determine whether or not it will begin recording the data it captures. A detector may detect the change in a magnitude of an inductance and/or an impedance of a circuit to detect insertion and removal of the weapon into and out of the holster. The holster is configured to couple to the detector to position the detector to detect insertion and removal of the weapon. An adhesive tape may couple a detector to a holster.

Abstract: Mobile communications devices are described. In an implementation, a mobile communications device includes a first housing that is approximately square and that includes a display device. The mobile communications device also includes a second housing that is approximately square, includes a keyboard and is rotatable with respect to the first housing at respective corners of the first and second housing. The second housing is rotatable with respect to the first housing between a first configuration in which the first housing substantially covers the second housing such that the keyboard is covered and a second configuration in which the keyboard is exposed.