Electronic horn and method for mimicking a multi-frequency tone
Electronic novelty device
Electronic signaling system
Electronic sound generator with enhanced sound
Electronic sound producing game animal distraction device for us
Fire sound simulator and related transmissions
Generating an alarm based on location and time
Handheld aid for the visually impaired
Haptic effect control system
Locating devices
Message emitting device
Method and apparatus for detecting radio frequency signals
Method and apparatus for driving a self-resonant acoustic transd
Method and apparatus for enhancing electronically generated soun
Method and apparatus for producing a sound from a handheld enclo
Method and circuit for emulating a trumpet contact breaker
Method and system for providing improved wireless audio transmis
Multi-function electronic horn warning system
Multiple signal audible oscillation generator
Notifying device using alternating drive signals