An electronic device is disclosed herein. The module has a rear cover, a reflective film and a high-reflective mode frame. The projecting sections other than the first specific projecting section, in principle, come into contact internally or externally with another projecting section other than the first specific projecting section. Circuit contacts are distributed about the bottom protective layer for electrically coupling the substrate electronic circuits to external electronic circuits. The audio driver adjusts the output volume of the speaker responsive to variations in ambient noise detected by the microphone so that the speaker produces a substantially consistent volume level in relation to the variations of ambient noise. and acts as both an overcurrent fuse and a thermal fuse by melting when subjected to a predetermined current or upon reaching a predetermined temperature.