It consists of a single wooden blade or "tongue" fixed in a block containing a contact microphone. Normally played by bowing the free end, it can also be struck or plucked. The location along the tongue where it is played will determine the frequency of its vibration, similarly to a wooden ruler held against the edge of a table.
The instrument described is a type of musical instrument that uses a wooden blade (tongue) fixed in a block with a contact microphone to produce sound. Its playing technique and the resulting sound are determined by the location on the blade where it is played, similar to how a ruler's edge can be used to create different sounds when pressed against a surface.