Let"s look for a variety of sound in the sound collector of handmade! Amplified in the circuit based on a small sound coming from the microphone is Handmade, simple assembly work kit of sound collector that can be heard in the loud sound from the earphone. Of the house, look for a variety of sound and the sound of distant and small sound of the outside, it is interesting experiment kit. 2, Handicraft bond x 1 9V square battery use [set contents] sound collector circuit board x 1 stereo earphone microphone x 1 x 1 paper body x 1 set double-sided tape x (sold separately)