First of all, thank you very much for choosing our CHD series products! In order to provide you with better after-sales service and protect your rights, we hereby make the following service commitments:

1Exchange terms:

1. If our company's products are damaged due to non-human factors within one month after being sold and affect normal use, our company implements a replacement guarantee system, provided that the product accessories are complete, the packaging is intact, and the appearance is not damaged. If the manufacturer stops production or is out of stock for more than a week, your company can choose to replace the products with equivalent products with the same function and configuration at the purchase price (the date of production of the sold products is based on our company's product label, and tearing or altering them is invalid).

2. If any damage caused by non-human factors occurs within three months after the sale of our company's products, which affects normal use, our company is responsible for timely repair within no more than three working days (excluding transit time). If the product cannot be repaired in a timely manner or if the same fault occurs again within one month after repair, our company implements a replacement guarantee system; The handling of out of stock items is as stipulated in Article (1) (the date of manufacture of the sold products shall be based on our company's product label, and tearing or altering is invalid).

IIWarranty terms(For detailed inquiries from relevant business personnel)：

1. If our company's products are damaged due to non-human factors during the warranty period, which affects normal use, our company is responsible for free repair. The repair time shall not exceed three working days (excluding transit time), and the round-trip shipping costs of the faulty products shall be borne by our company (the warranty period shall be subject to the purchase contract or cooperation agreement signed by both parties, the same below).

2. During the warranty period, if there is damage caused by improper customer operation or human factors, as well as external interference, the customer can send the product back to our company for maintenance. Our company only charges the startup inspection fee (* * yuan/unit) for the maintenance equipment and the cost of the replaced components. The round-trip shipping cost is borne by the customer themselves.

IIIRepair terms(For detailed inquiries from relevant business personnel)：

1. If any malfunction occurs during the warranty period of our company's products after they are sold and affects their use, customers can return the products to our company for maintenance. Our company will charge the startup maintenance fee (* * yuan/unit), labor fee (* * * yuan/unit), and hardware replacement fee for the maintenance equipment. The round-trip shipping cost of the faulty products will be borne by the customer themselves.

If the repaired equipment is unable to be repaired due to strong lightning strikes, water corrosion, or external interference, our company recommends scrapping it and purchasing new equipment. If the customer insists on repairing it, our company will not be responsible for the warranty after repair.

4On site service terms:

1. During the product warranty period, at the request of the customer, our company can provide on-site service. For any project constructed by our company, if there is a quality problem with our company's products, the cost of on-site service will be borne by our company. If the damage is caused by the customer's own improper operation or human factors, as well as external interference, the round-trip and labor costs will be borne by the customer (see Article 5 for charging standards).

2. During the product warranty period, if the project undertaken by our distributor encounters problems that the distributor cannot solve on their own and requires our company to provide on-site service, our company will charge corresponding technical support fees (see Article 5 for charging standards).

5Pricing(For detailed inquiries from relevant business personnel)：

1. After sales maintenance fees for the product: startup maintenance fee of * * yuan/unit, labor fee of * * yuan/unit, and damaged components will be charged at the purchase price.

2. On site service fee: Hardware maintenance fee * * * yuan/person/day, software maintenance fee * * yuan/person/day, food and accommodation standard * * yuan/person/day (food and accommodation fees are charged separately according to the city's consumption level and the position of the next station personnel, or arranged by the customer), transportation fees are paid according to the actual amount incurred.

VIResponse time:

1. When receiving inquiries from customers regarding equipment usage, promptly respond to them, guide them in resolving their issues, and truthfully record and track the progress of problem resolution.

2. When receiving on-site technical support requests from customers, immediately handle relevant procedures and transfer them to the customer service department for arrangement, ensuring that the customer is informed of the schedule within 2 hours, and strictly follow the agreed time to rush to the site for processing (excluding transit time). If there are special circumstances that prevent the customer from rushing to the site on time (such as flight cancellation, etc.), the customer should be informed within 2 hours.

3. When receiving the customer's repaired product, the customer should be contacted within 4 hours of receiving the product to confirm the receipt status, understand the cause of the product failure, and send it to the maintenance department for inspection and analysis within 8 hours to ensure that the repair is completed within 3 working days and returned to the customer. If the product cannot be repaired on time due to special circumstances, the customer should be informed and the reason for the delay should be explained, but the maximum delay in processing should not exceed 5 working days.

7Notes:

In order to better fulfill our commitment to our customers, we hope you can cooperate with us to achieve the following:

When repairing the product, please also send back the faulty parts and package them properly, and attach a list indicating the product model, quantity, fault symptoms, and contact information of the on-site technical personnel.

2. When repairing the product, please indicate the recipient and contact information of the repaired product so that our company can return it after inspection. When filling out the repair list, please keep the handwriting neat for us to verify, ship, and archive; We are not responsible for any loss of goods caused by other companies transferring the goods on our behalf.

3. After the product is returned for repair, please inform us of the shipping date, shipping list, and transportation unit in a timely manner by telegram or phone, so that our company can respond as soon as we receive the repaired product.

4. After sales service hotline:, ，，

After sales service reception process diagram: