Interestingly, good amplification device first prize

I don not have specific utility of the use of this device, but just curious to see the possibility of concentrating the sound with the parabolic shape. this device has given me satisfaction, the sound is amplified and clearly there is a serious filter - acute. The internal storage capacity is almost nonexistent and useless, but you could easily connect a parallel dictaphone on the helmet. we must constantly pull the trigger to operate the unit or put a rubber band. You also need a battery or a 9V battery. A good device in abstract.