The truth is that they work very well and provide a natural warmth and boost for vocals necessary for recording

This is what the item is said to do:Hand-selected 12AX7 vacuum tube with UTC technology for exceptional warmth and lowest noiseThe ultimate sound-enhancing tool for virtually any sound sourcePerfectly complements studio-grade condenser micsHigh-end tube mic/line preamplifier for studio, live and hard disk recording applicationsEliminates the "dull" sound of standard digital recorders and sound cardsNow let me go through what it actually does

This says it is hand selected for "exceptional warmth and lowest noise

Hand-selected 12AX7 vacuum tube with UTC technology for exceptional warmth and lowest noise?

Works as it should...

This is a really good, cost effective preamp that comes stock with an unreasonable amount of hum

the LED's progressively extinguish (R to L) until they're all off