diff --git a/Arylic_Amp_v2.0.md b/Arylic_Amp_v2.0.md
index 1db0bf4..287fdc3 100644
--- a/Arylic_Amp_v2.0.md
+++ b/Arylic_Amp_v2.0.md
@@ -1,5 +1,7 @@
 # Hardware for Arylic Amp v2.0 (pcb v1.1)
-My Arylic Amp v2.0 device is using a  amplifier chip TI3116 from Texas Instruments and a AP8064 from MV silicon. 
+My Arylic Amp v2.0 device (sold in 2020 as 'Up2stream WiFi and Bluetooth5.0 HiFi Stereo Class D digital multiroom audio amplifier board 2.0', version on pcb show v1.1) is the predecessor of the Up2Stream Amp v4.0, see https://cdn.shopify.com/s/files/1/0072/6899/1049/files/Up2Stream_AMP_Mono_Manual-EN.pdf.
+
+It is using a TI3116 from Texas Instruments as an amplifier and a AP8064 from MV silicon as MCU. According to https://www.diyaudio.com/community/threads/wiimu-a31-module-in-combination-with-adau1401-1701-dsp.345544/post-6137759 the I2S output of the A31 module is 16-bit with a sample rate of 44.1kHz (CD quality).
 
 Here's a picture of the pcb with high resolution:
 ![IMG_5103](https://github.com/Jan21493/Linkplay/assets/25911411/11670dc0-3a9a-43b0-88c2-1cff8c1c1a15)
@@ -7,7 +9,3 @@ Here's a picture of the pcb with high resolution:
 The following picture shows the AP8064 in detail:
 ![IMG_0048](https://github.com/Jan21493/Linkplay/assets/25911411/eebfc17d-d24d-4af9-b65b-878175e73d64)
 
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