there are many bad trader in the international business, usually they will exaggerate the effect of the device and give you a good price, even tell you “we are manufacturer”. after obtain your money, they will search for the machine, Maybe the machine is same with that they show you, maybe not.
Then they will give the manufacturer the order, some trader will lower the machine’s configuration in order for the more profit, even if you have tested the machine, they will change the parts before shipping.
Both manufacturer and purchaser are victim. How to gurantee the your machine safe?
1: try to do business with manufacturer.
2: test the machine term by term.
3: check the main configartion and make mark on every important parts
3: check again before package(living video if possible)