Abstract: A self-fastening device for joining two objects together. The fastening device has a main slot for receiving an anchor from a second object and at least one branching slot for accommodating a latch, which by spring, magnet or gravity force is biased to the engaged position. When the anchor is inserted into the fastening device it is locked inside securely, fastening the two objects together. When a magnet strong enough to overcome the biasing force is brought from outside of the object into the vicinity of the latch, it moves the latch away from the engaged position, thereby unlocking the anchor and unfastening the objects.

Abstract: A holder system for a device has a retracting mechanism allowing efficient storage of a lanyard inside the housing. The holder system has a housing and a slider which have one or more pivotal drums. The lanyard travels around the one or more pivotal drums alternating between the housing and slider, and creating folds. When a wrist strap is present, drawing the wrist strap out from the housing pulls the moving slider downwards, extending the length of the folds and storing more lanyard inside the housing. Conversely, drawing the lanyard out of the housing draws the wrist strap inside.