All products returned to AmpliVisionS for warranty or non-warranty repair require that an RMA (Return Materials Authorization) be obtained prior to shipment of the product to AmpliVisionS. An RMA number may be obtained via E-mail to sales@ampliVisionS.com, via phone, +86(28)61892455. The RMA number shall be clearly labeled on the outside of the packaging. Products returned to AmpliVisionS for repair or replacement without an RMA number may be returned to the customer at customer cost without action at the discretion of AmpliVisionS. Products returned for non-warranty repair, or those determined to bye exceptions to the warranty by AmpliVisionS for cause, also require that a purchase order be issued for the estimated cost of repairs. No repair effort will commence on non-warranty items until the customer has authorized the repair and cost, if applicable.