Abstract: Educational display boards are in widespread use—from classrooms to boardrooms. A display board is a thin substantially planar material imprinted with graphics and text that often conveys a relationship between elements. The present invention is specifically a design for interactive educational display boards upon which users interact by touching one contact associated with a term corresponding to a question, and one or more terms corresponding to an answer selection. User bodily resistance is sensed by the circuit as user input; to which the interactive display board responds with a variety of audio tunes and tones in relation to these user choices.

Abstract: An audio signaling device designed for mounting on spring-loaded rodent traps. The device audibly signals when its associated trap has been triggered. Upon reliable detection of triggering, an audio signal is emitted as an initial audio tone sequence followed by an audio beacon mode; wherein operation alternates between long periods of very low-power silent operation and short audio tone sequences. The device may be reliably attached to traps of various sizes and designs, while the power provided by the battery powers it for extended periods. Additionally the signaling device can be programmed to generate unique audio tunes while being easily manufactured from low-cost parts.