Meet the Khadas Tea: a high resolution headphone amplifier that brings you richer sound on your phone. It comes with an ESS ES9281AC Pro DAC chip and lets you attach a high-fidelity 3.5mm headphone to your phone. It measures 7.5mm, so you can easily fit it in your pocket.
Tea is made with a single piece of anodized aluminum. It is powered by a 1160mAh battery that lasts up to 8 hours. Tea has two microphones, so you can make and receive calls without having to remove your headphones. It plays well with iOS and Android devices.[where to get it]