-The earphones' case must be able to be closed.
-Must be handled more comfortably.
B
-The liquid crystal screen's glass must be waterproof.
C
-The input keys on the handles must cromatically
distinguish.
-The audio input must be reiceived and passed
on inside processor from outside by two little and light but powerful microphones,
placed on front side.
D
-Around the visualizer must be a lining to prevent
accidents.
