Our handcrafted, high-end passive and tube preamplifiers and buffers are based on our proprietary light-dependent resistor (LDR) attenuation technology. The size of an M&M candy, these digitally-controlled, analog resistors control volume using light from a sealed LED and an embedded photoresistor. The resulting attenuation yields a clear, natural and highly satisfying sound with minimal manipulation of the audio signal. Designed, manufactured, assembled by hand, and shipped to you directly from South Florida.