Designed with LDR(Light Dependent Resistor) alone, excluding other parts from input to output circuit, LST X-GEN preamplifier allows ultra-low loss of signal transmission, providing dynamic crystal sound against a completely noise-free background. - LDR based switchless input board - LDR based optical volume control - No amplification circuits - The signal paths exclusively consist of LDRs - Pure analog - USB powered Please refer to the linked catalog for more information about LST X-GEN. link: https:www.highendcity.com #lstxgen #ldrpreamplifier #nasotec #preamplifier