LZFuiop B4 X - Portable Rechargeable 450mW

HiBy FC1 - Portable Headphone Amplifier USB DAC

HiBy FC4 - Headphone Amplifier Portable DAC

POENVFPO HiFi Headphone Amp - 600mAH Rechargeable Aluminum Alloy Black

Bewinner Portable Headphone Amplifier - 16Ω-300Ω 1080mAh

LZFgjsc B4 X

eSynic Headphone Amplifier - 16~300 ohm Rechargeable 3.5 mm

SilteD HiFi Headphone Amplifier

TANCHIJIM Luna AT - Portable USB DAC AMP Dual 3.5mm 4.4mm Outputs

YGiTK 16-600 Headphone Amplifier - Bass Boost Rechargeable

SOSSEG Headphone Balance Amp - Vacuum Tube Rechargeable