Features:

The TPA3255 is a high-performance Class D power amplifier with Class D efficiency and true to high-end sound quality. The device features an advanced integrated feedback design and proprietary high-speed gate driver error correction (Purepath Ultra HD).
The dual 300W shocking bass output is compatible with passive stereo speakers of most sizes and impedance specifications.
Texas Instruments TPA3255, digital audio amplifier BTL bridge power output 300W * 2 channel design, THD less than 0.03% when working continuously
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Parameters:

Amplifier chip:TPA3255

Output power: 300W+300W

Number of channels: 2.0 channels/Stereo

SNR:110db

THD+N:0.008%

GAIN:21.5db

Ressponse:20Hz-20KHZz

Power supply: DC24-48V (outer diameter 5.5mm inner diameter 2.5mm)

Recommend DC48V 7A or more power adapter.
maybe you also need DC48V 7.5A Switching Power Supply

Impedance: 4-8 Ohm

Size:151*100*33MM

Youtube:

https://www.youtube.com/watch?v=byj_BDf5xwM

DIY Forums:

https://www.audiosciencereview.com/forum/index.php?threads/aiyima-a07-tpa3255-review-amplifier.18984/

https://www.audiosciencereview.com/forum/index.php?threads/aiyima-a07-tpa3255-tear-down.19020/

Package included:

1*A07 Amplifier

1*Manual

1*Power adapter(Optional)