Do you pay the custom tarif fee even when I order from China Warehouse? (shipped to Czech Republic)

I orderd a 3d printer and paid and the order Is processing but i noticed that I made a couple of mistakes could you guys help me out?

Does this work on Windows 7 Ultimate 64 bit?

I placed my order 5 days ago and it is still processing. My order number isAN18D21S4957-QC9V9F. Why is my order still processing? And when will it be

Can you tell me if this battery is compatible with the syma x8sw     RM9417

I would like to cancel my order of the xiaomi xiaowa. How can I do it? 

can it boost 2g 3G GSM signals ?

Regarding order number BA18D23J4135-U4BPJ6.I placed my order on the 23/04/18 and specifically paid £13.35 for priority shipping.Can you please explain

Are the LED lights 850nm or 920nm? Do they shine red at night or are they the 'darklight' LED's?

I choose the expedited shipping and payed for .But at this time, I have not received any shipment notification. What about it?