An audio-contents demo system includes a WWW server, a system server, and a mobile telephone device. The BTBT device is configured as an injection device for injecting a first charge onto the floating gate when the BTBT device is biased so that it is in accumulation, to set at least one of the logic levels. Set angular positions are provided by the bracket, with changes in positioning requiring actuation of an internal locking mechanism by the operator during use of the tool.