Carav: With our experience, it is better for you to have a hardware engineer, Once meet problems,you check and solve it at the first time ,avoid causing other trouble ,even irreversible damage. Also you could return to us ,in order to save the shipping cost ,you’d better collection 3pcs of damaged one,then send back to us together. Shipping cost you pay yourside, we pay ourside.
A: Each POS machine will ageing test 48 hours ,to guarantee all POS machine are in the perfect condition before shipment .we also accept the inspection by the third part you appointed.