1. When soldering, water-soluble flux may corrode this SIM card product, please avoid trial. 
2. When welding the terminals of the SIM card holder , if a load is applied to the terminals, loosening, deformation, and deterioration of the electrical characteristics may occur due to different conditions. Please pay attention during the trial. 
3. Solder twice. Please do it after the first soldered part has returned to normal temperature. Continuous heating can cause deformation of the outer portion of the SIM card holder , loosening of the terminals, and loss of electrical properties. 
4. Set the welding conditions according to the actual mass production conditions. 
5. Avoid flux flow from the printed circuit board to the SIM card holder product. 
6. This product is directly operated by human structure, please do not use for mechanical detection function.
7. Printed circuit board mounting hole pattern, please refer to the recommended dimensions described in the product drawing. 
8. Do not wash. 
9.MINI type SIM card products such as thin switch in the combination of the installation process, please be careful not to exert external force. 
10. Under low voltage conditions (DC1V or less), there is a possibility of poor contact. When used for this condition, please confirm it separately. 
11. Products with mounting screws should be carried out within the specified tightening force to avoid possible thread damage. 
12. This product is designed and manufactured under the premise of DC resistance and load. When using other loads (inductive load, capacitive load), please specify it separately. 
13. In the use, test process, if more than the specified load, the switch may be damaged. Please kept informed! 
14. Please install the product on the specified mounting surface and make the installation level. If the level is not reached, it will cause malfunction.
15. If it is used in a dusty environment, dust will enter through the opening and cause contact failure or malfunction. Please design in advance. 
16. If you use it in a corrosive gas environment, it may cause poor contact, etc. Please design it beforehand. 
17. Storage method  
   1 Please keep it in normal temperature, humidity, place exposed to sunlight and non-corrosive gas, and limit it within 6 months from delivery. Please use it as soon as possible. 
   2 In the 15th day after receipt of the goods, we found quality defects. Please contact us in time. 
   3 Please do not pile up too much.