Inputs, Outputs, Controls, and Functions on Your WIIM PRO PLUS Explained 

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What's in the box:
User Guide x1
USB Type-C Cable x1
USB Power Adapter x1
RCA to RCA stereo cable x1
Digital Optical Audio Toslink Cable x1
Features:
Ethernet: Y
DAC IC: AKM 4493SEQ
Analog Out SNR: 121dB
THD+N (Analog Out): -113dB (0.00023%)
Analog Input (ADC): Up to 192k, 24bit
Chromecast Audio: Y
Group with Nest speakers and Display: Y
Group with Echo speakers and Display: Y
Alexa Multiroom with UHD: Y
Group with HomePods: Y
Works with Alexa: Y
Works with Google: Y
Works with Siri: Y
Group with WiiM or Linkplay devices: Y
AirPlay 2: Y
AirPlay Cast: Y
DLNA: Y
Spotify Connect: Y
TIDAL Connect: Y
Gapless Playback: Y
10-band Graphics EQ: Y
Linkplay Music Streaming Platform: Y
CPU: Quadcore A53
DRAM: 512 MB
Flash: 512 MB
Audio Input Port: Line-in, Optical
Audio Output Port: Line-Out, Optical, Coax
MP3: High Quality - 320 Kbps
CD(HI-FI): Lossless Quality - 1411 Kbps
HI-RES: High-Res Quality - 2304-9216 Kbps
Specifications:
Dimensions and Weight: 5.5" x 5.5" x 1.6"
Wiim Pro Plus Weight：400g (14.1 oz)
Audio Input: 1 x Analog RCA Line input, 2 Vrms, 192 kHz/24-bit, SNR 106dB, 1 x SPDIF in Optical, up to 192kHz/24-bit
Analog Audio Output: 1 x Analog RCA Line output, 1 x Digital optical (SPDIF) output, 1 x Digital Coaxial output, up to 768kHz/32-bit, DSD512
Internal DAC IC: AKM4493SEQ
SNR (built-in DAC): 120dB
THD+N (built-in DAC): 0.00032% (-110dB)
Network: 802.11 b/g/n/ac 2.4 GHz and 5 GHz dual bands Wi-Fi
Bluetooth: Bluetooth 5.1
Digital Audio Output: Bit-perfect output, up to 192 kHz, 24-bit with digital optical or coaxial output.
Audio Codec: MP3, AAC, ALAC, APE, FLAC, WAV, WMA, OGG
Protocol: AirPlay 2, Chromecast Audio, DLNA, Spotify Connect, TIDAL Connect, Amazon Music Casting, Qplay 2.0, Roon
Streaming Services in App: Spotify, Amazon Music, Deezer, Tunein, Tidal, Qobuz, SoundCloud, Pandora, iHeartRadio, vTuner, Napster, Sound machine, etc.
Power Input: USB Type-C, requires 5V, 1.5A or higher, Bundled adapter: 5V, 2A
LED: Three color status LED - Red, Green and White
Button: Capacitive touch buttons - Play/Pause, Volume +, Volume -, 1 x Preset
Accessory: WiiM Voice Remote, Premium RCA Cable for Line Out