Resonessence Labs Herus

In case of small portable USB DACs there is the flavor of the month DAC

There is the Audioquest DragonFly doing 24/96.

This was pretty soon surpassed by the Meridian Explorer doing 24/192

Now there is the Herus supporting PCM up to 24/352.8, DXD and DS64/128

Herus $ 350.00

Small PCM and DSD capable USB DAC
63.5mm (2.5in) long, by 31.7mm (1.25in) wide and 19mm (0.75in) high

Asynchronous USB Audio 2.0: PCM bit width 24 or 16
Supported Data Rates: 44.1, 48, 88.2, 96, 176.4, 192 and 352.8 Ks/S
Supported Formats: PCM, DXD and DSD64/128 Uses DoP protocol 1.1 over USB for DSD
Operating Systems MS Windows, MAC OS and Linux

Use the Resonessence Thesycon Driver for USB Audio 2.0 on Windows
Output Signal Level At Maximum Volume level: 2.4 VRMS
Output Impedance:   0.2 Ohms
SNR at least 100 dB, Typically 108dB
THD at least 85 dB, Typically 90dB