We allow a replacement, but you should pay more attention on this article:
Please install and operate the items with the guidance from the professional.
otherwise; we will not accept the replacement
Please contact with me first when you decided to send the items back,
and let me know the reasons besides you have to offer the photos of the items
When the items send back, please make sure the whole package in a good condition
The buyer has to offer the shipping cost when the items send back,
and we pay the freight re-shipped