Here's what I know about itech
itech Direct:https://www.amazon.com/itech
itech Distributor:https://www.tequipment.net/search/?F_Keyword=itech
If there are other models that cannot be found on these two sites, I will contact the itech staff members directly
E-Mail: info@itechate.com
Service Hotline: +886-3-6684333
Technical Support: fae19@itech.sh
Hope these are helpful to you