1. Freely offer field investigation and training to user and at least approach following level: command general operation principle, use method, emergency relief, common maintenance and some other used skills.

2. Quality assurance: qualify certificate for the main using material. The chemical composition of the material, mechanism and other property meet our national standard. The material report list will be submitted.

3. Ensure to provide best after-sales service, if user found any problems about our product, we will arrive on the field to handling within 24 hours (within 48 hours for remote area) after receiving your calls.