A computing device can receive an indication of a change in the proximity state of a first structure of an attachment mechanism and a second structure of the attachment mechanism. Responsive to receiving the indication, the computing device can be operable to change, based at least in part on the indication, a current access mode provided by the computing device. In some examples, both the computing device and the attachment mechanism may be part of a wearable computing device. In other examples, the computing device may be or be part of a physically separate device from the attachment mechanism.