clone M7 pre-amplifier

Hi i-Mission

I intended to purchase the Music angel  Clone M7 Pre-amplifier. Would you please send me further information that listed as below:
1. What kind of materails used to build this Pre-amp. transformer?
2. What are the max.output voltage of this Pre-amp.?
3. Photo for the rear part?
4. How heavy of this Pre-amp.?

I can be reached at 91607642. Thank you for your kind attention.

Regards,
Simon