Abstract: An electronic device fastener (EDF) to protect a portable device that is placed in a holder which may be a case, belt clip, holster, cradle, or the like worn or carried by the user that uses a release sensor, proximity sensor, shock sensor, and clip sensor to protect a portable device such as a cell phone, portable media player, personal digital assistant (PDA), two-way radio, GPS device, headset, or earpiece from loss and misplacement. The system can provide up to five modes of protection against loss and misplacement of a portable device.

Abstract: An electronic device fastener (EDF) to protect a portable device that is placed in a holder which may be a case, belt clip, holster, cradle, or the like worn or carried by the user that uses a release sensor, proximity sensor, shock sensor, and clip sensor to protect a portable device such as a cell phone, portable media player, personal digital assistant (PDA), two-way radio, GPS device, headset, or earpiece from loss and misplacement. The system can provide up to five modes of protection against loss and misplacement of a portable device.

Abstract: In one embodiment, a race set is described. The race set may comprise a portable race management device, comprising: a detachable lane defining element configured to be actuated; a starting indicator; a finishing indicator; and circuitry configured to receive start and/or finish signals via actuation of the detachable lane defining element, control actuation of the starting indicator upon race starting, and control actuation of the finishing indicator upon race finishing. Various alternative embodiments and alternative example race sets are also included.