Buyer's note:

1. The goods in our store are genuine and will be inspected thoroughly before delivery. There will be no quality problems; For example, due to the negligence of the staff, the quality of the goods and the problem of wrong delivery will be replaced free of charge. Please feel free to buy.

2. The goods in this store are shot with real people, without any fake. What you buy is exactly the same as what you see on the picture. The quality problem is that the buttons are loose and the screen is black. For example, color, workmanship and imagination are not considered as quality problems. Please ask more questions before purchasing. Leave few regrets. If you can't accept less color difference problem, please buy carefully!

Iii. Return and exchange of goods:
If the baby is not suitable, it can be exchanged and the round-trip freight shall be borne by the buyer, so shall the return of the goods (all for the reason of the buyer, the buyer shall bear the round-trip freight). For example, if the goods are sent out wrong, quality problem, return or exchange, the round-trip freight shall be borne by the seller (all for the reason of the seller, the seller shall bear the round-trip freight).

Please don't forget to evaluate the goods after receiving them. I hope you will be satisfied with our work! If you are satisfied, please tell your friends.
Hope to have the opportunity to also let them experience the network shopping fun!! If you are not satisfied with anything, please contact the owner. The owner will solve the problem for you in a timely manner. That will not solve any problems, the shop to the quiet to the poor rating of the buyer complaints to the end, please understand each other, pay attention to their own evaluation. thank you

V. goods signed and received! When signing for goods, please make sure to check whether the quantity of products is correct, complete and damaged in the presence of the Courier. & hellip; Etc.  If you find any problem, please reject it on the spot. Please sign for it after confirmation!

Steps/methods

1. Replace the battery in time: when the reading shown is dim, it indicates that the battery is exhausted and should be replaced in time. If not used for a long time, the battery in the machine should be taken out to prevent the battery leakage corrosion damage calculator.
   
   
   
    
2. Prevent extrusion: knock or drop on the ground: neither fluorescence digital tube display calculator or liquid crystal display of calculator, the display device to easily broken glass device, should be strictly hinder extrusion knock or drop, so as to avoid damage.
   
   
   
    
3. Pay attention to use the environment: liquid crystal display (LCD) calculator can only use in 0 to 40 degrees Celsius temperature range, and should not be used under the strong light, because the ultraviolet ray in sunshine can accelerate the aging of the LCD panel. It is also not suitable for use and storage in moist and corrosive environment, so as to avoid damage to the machine parts.
   
   
   
    
4. Pay attention to dust prevention: after use should be put into the leather or plastic cover, to prevent dust intrusion. If there is dust on the panel, can use soft cloth to wipe gently, do not use gasoline, ethanol, banana water and other chemical test clean.
   
   
   
    
5. If the external power supply is used, its extreme xing and rated voltage should meet the requirements of the machine.