I checked the power after purchase, but I haven't used it. I've also performed a noise check, so it's not completely new. I forgot to take photos and already packed it, but it's in the original box and includes the warranty, manual, power cable, etc. I purchased it from Music Plant, but it was a year ago, so the warranty might have expired. 2-Channel Microphone Preamp The Crescendo Duo, featuring SPL's 120V technology, is a 2-channel microphone preamp with a fully balanced signal flow. The input stage uses matched 10 pairs of PNP transistors (differential input transistors) to achieve extremely low noise and high common-mode rejection. Each input stage uses six 5th generation 120V SUPRA op-amps. The transformerless input/output stage design guarantees highly linear amplification. The output stage operates as a current amplifier, providing Class-A operation with a quiescent current of 6mA or more.