Abstract: The present invention relates generally to a portable/wearable device as well as application or a software program to be downloaded onto a mobile device or computer. The present invention is intended to measure sound intensity/level and provide an alert signal to remind user(s) or crowds (i.e groups of people) that they are speaking too loud or making too much noise. Furthermore, optionally, the device may play a pre-selected music or pre-recorded message when the sound level threshold is exceeded, which can encourage all of the users to use the bio-feedback of the present invention to relax when they see the visual que such as the light color changes, hear the music, message or produced from the device. Another object of the present invention is to help people to know whether his/her voice is loud enough to be heard by people who have hearing impairment.