YOHOOLYO portable head-amp for $20

The new condition portable YOHOOLYO headphone amp is down from its usual price in the high 20s to $20, sold by a marketplace seller with the order fulfilled by Amazon, so Prime shipping or with a $25+ order. It averages 3.9 out of 5 based on 50 customer reviews and it has 16 answered questions. It takes microUSB audio input and spits out audio through the headphone jack.