Neoteck 16-150Ω Headphone Amplifier Portable Earphone AMP 3.5 mm Audio USB Cable | eBay
Amazon.com: HiBy FC4 Headphone Amplifier Portable DAC with 4.4mm and 3.5mm Headphones Outputs Support MQA16X PCM768K DSD256 High Driving Power for Android/iOS/Mac/Windows : Electronics