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Amplification Electronic Project Kit (Soldering Required) The Velleman MK136 Super Stereo Ear Minikit is a stereo audio amplifier that is capable of making sound 50 times louder. This DIY minikit uses 2 on board microphones for the input and a headphone jack for the output. The kit also includes an on/off switch, and a potentiometer which can be used to adjust the volume. This mini amplifier is easy to build and useable as a hearing aid, a science project, a headphone add-on, or merely a fun DIY project. Exercise patience and caution when building this, and you’ll find yourself with a neat working amplifier in no time! Specifications Power supply: 3 1.5V AA batteries (not included) Dimensions: 2.4" x 2.1" x 1.7"