Amazon.com: iFi Hip-dac Portable Balanced DAC Headphone Amplifier for Android, iPhone with USB Input Only/Outputs: 3.5mm Unbalanced / 4.4mm Balanced (Unit only) : Electronics
Amazon.com: Audiolab Portable Headphone Amplifier Audio Powered USB DAC Headphone Amp for Phone (Android,USB-C Port) : Electronics
FiiO Q3 Amplifier Headphone Amp High Resolution DAC DSD512 for Smartphone/PC/Laptop/Home/Car Audio 2.5/3.5/4.4mm Output : Electronics
iFi Hip-dac2 - Portable Balanced DAC Headphone Amplifier for Android, iPhone with USB Input Only/Outputs: 3.5mm Unbalanced / 4.4mm Balanced – MQA Decoder : Industrial & Scientific
Amazon.co.jp: HIDIZS S9 PRO Balanced & Single End Mini HiFi DAC & 768kHz/32-bit, DSD512 Portable Audio Codec Amplifier for iPhone, iPod, Android PC, Windows/Mac OS : Electronics
iFi Hip-dac2 - Portable Balanced DAC Headphone Amplifier for Android, iPhone with USB Input Only/Outputs: 3.5mm Unbalanced / 4.4mm Balanced – MQA Decoder : Industrial & Scientific
Amazon.com: iFi Hip-dac Portable Balanced DAC Headphone Amplifier for Android, iPhone with USB Input Only/Outputs: 3.5mm Unbalanced / 4.4mm Balanced (Unit only) : Electronics
Amazon.co.jp: LAMSCAT Portable Headphone Amplifier, Built-in DAC Chip 3.5mm Headphone AUX Audio Decode Amplifier, USB Type-C Hi-Res Mini HiFi Sound Quality Headphone Amplifier for Windows 10 / Mac OS/iPad OS/Android/iOS System (USB-C
iFi Hip-dac2 - Portable Balanced DAC Headphone Amplifier for Android, iPhone with USB Input Only/Outputs: 3.5mm Unbalanced / 4.4mm Balanced – MQA Decoder : Industrial & Scientific
Amazon.co.jp: HIDIZS S9 PRO Balanced & Single End Mini HiFi DAC & 768kHz/32-bit, DSD512 Portable Audio Codec Amplifier for iPhone, iPod, Android PC, Windows/Mac OS : Electronics
Headphone Amplifier DAC Portable Amp - HiFi Audio USB Earphone Amp Decoder ES9028Q2M XMOS XU208, Support 16-600Ω Earphone 32bit/192KHz DSD256 with Bass Boost and Gain Switch for Phone Laptops PC MP3 : Electronics
Amazon.com: ONKYO Portable Headphone Amplifier DAC Equipped with Black DAC-HA200(B) [Japan Impot] : Electronics
USB DAC Headphone Amplifier, Portable 3.5mm/ 4.4mm Headphone Amplifier Two-Stage Gain Switch, 16-300 Ohm, Support Type C/ 3.5mm AUX Audio Input : Electronics