Patent ID: 7755471

Claim:
A self-contained motion sensitive audio module for a sign modified by forming an aperture sized to accommodate a sensor, said module comprising a sensor circuit communicatively coupled to a sensor, a power supply operatively coupled to the sensor circuit, a timing circuit operatively coupled to the sensor circuit, an audio circuit operatively coupled to the timing circuit, said sensor circuit being adapted to produce a trigger signal and communicate said trigger signal to the timing circuit when a sensible condition is sensed, said timing circuit being adapted to produce an activation signal and communicate said activation signal to the audio circuit upon receiving a trigger signal from the sensor circuit, said audio circuit being adapted to produce an audible sign message output corresponding to an audible sign message upon receiving an activation signal from said timing circuit, said module being smaller in length and width than the sign and attachable to the back of the sign, said timing circuit being configured in monostable mode and said audio circuit being configured to produce the audible sign message output for the lesser of the duration of the activation signal or the duration of the audible sign message.