iFI xDSD portable DAC AMP
in working condition
I don't know the remaining life of the battery.
Can be replaced by Ifi Audio

Burr-Brown DAC chip’s four-channel True Native design
Hi-Res Audio PCM data to 32-bit/768kHz, DSD up to DSD512
3.5mm coaxial/TOSLINK combo SPDIF input
Hi-Res streaming Tidal (MQA) ou Spotify

Inputs:
USB 3.0 type ‘A’ (USB2.0 compatible)
S-PDIF (3.5mm coaxial/optical)
Bluetooth 3.0™ ( AAC, SBC, aptX, aptX Low Latency)

Supported Formats:
DSD: 512, 256, 128, 64, Octa, Quad, Double, Single-Speed
PCM: 768, 705.6, 384, 352.8, 192, 176.4, 96, 88.2, 48, 44.1kHz
MQA

Outputs:
S-Bal (SE) 3.5mm


https://ifi-audio.com/products/xdsd/

bought 550$ + taxes (Canadian)
asking 150$
no exchange