The device is meant for entertainment purposes. For potential misuses regarding people using this product as a baby-monitor or security system, various labels and warnings would be put on the device to warn them of using the device for its unintended purpose. While the system may work as a general audio sensor for the deaf it has not been tuned for this purpose.
Other Related Hazards:
One potential hazard is that the device is senitve to moisture and can not be used in the normal mode near water.