YOHOOLYO XU09 portable head-amp for $25

A $3 off clip-on coupon is running for a limited time at the Amazon listing of the YOHOOLYO XU09 portable headphone amp dropping its price from $27.99 to $24.99. Free shipping for Prime members or with a $25+ order (yes, the irony of the coupon discount taking away the free shipping).

This is a headphone amp only, it takes 3.5mm input and outputs through the 3.5mm headphone out. The microUSB on the back is for charging the built-in battery. It has a volume dial, and a separate on/off power button, along with an LED light. It averages 3.9 out of 5 based on 41 customer reviews and has 14 answered questions.