Aaand what did i forget?
-SNR : Audible if you stand 30cm away from some mid-spl speakers, if the distance is bigger, you don't hear anything
- Input gain : matched to louder mobile phones and sources, you can't drive it into clipping with a normal phone, yet the gain is high enough. only with stronger phones, laptops and similar sources, you can get it into clipping

Datasheet of the chip : [ Ссылка ]

no Datasheet or schematics from sure so far, here is the product link
[ Ссылка ]

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