After receiving this product I checked the power consumption and noise level. My test environment has a noise level of 35 dB. At high level, the power is 3.18W and the noise is 51dB. At medium level, the power is 2.56 watts and the noise level is 47 dB. At low level, the power is 1.84W and the noise level is 43dB. It turns out that even an old 5V1A USB power adapter can easily handle it. And it was reasonably reasonable to count how much air it's pushing through. I will recommend buying this product.
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