Right, the module seems to be sold by many different sellers in asia. Dont expect to get documentation or service, they just sell it.
The boards are named "XF-P100" and "XF-LPF-HF".
I am not promoting these modules as the amp can be changed to whatever you like, i just wanted to control it via i2c using Arduino.
@Timothy : I have tried to run in on 24V and my Zetagi HP500 showed 90W output with 5W drive. Given the MRF186s specs, wheres the catch ?