Note to buyers:

1. The goods in this shop are genuine and will be inspected thoroughly before delivery. There is no quality problem; If the quality of the goods and the wrong issues are caused by the negligence of the staff, they shall be replaced free of charge. Please feel free to choose.

2. The goods in this shop are made in real life, and there is no fake. You can buy the same thing as you see on the picture. The quality problem is that the product button is loose, the screen is black screen and so on. In the case of color, workmanship and imagination, it is not considered a quality problem. Please ask the buyers to ask questions before purchasing. Regret less. If you can't accept less color difference, please buy carefully!

Iii. Return and replacement problems:
If the baby is not suitable for replacement, the freight shall be borne by the buyer, and the return will be the same (all the buyer's reasons, the buyer should bear the freight to and fro); For example: send the wrong goods, quality problems, return or exchange, and the freight shall be borne by the seller (all the seller's reasons, the seller shall bear the freight to and fro).

4. Please don't forget to comment after receiving the goods. I hope you will be satisfied with our work! If you are satisfied, please tell your friend,
Hope to have the opportunity also ask them to experience the network shopping fun!!! If there is any dissatisfaction please contact the shop owner, the shop owner will timely solve the problem for you, the misunderstanding often comes from the communication not timely, also please respect the shop owner's labor, do not easily make the bad review! That can not solve any problem, the small shop is not silent to the buyers of the middle and poor criticism to the end, please understand each other, pay attention to their own evaluation. thank you

5. Merchandise signing! When signing the goods, please make sure that the product quantity is correct, whether the product is complete, whether the product is damaged or not. Etc.  If you find a problem, please reject it on the spot. Please sign again after confirmation!

Step/method

1. Replace the battery in time: when the detected reading is dark, the battery is exhausted and should be replaced in time. If the battery is not used for a long time, the battery should be removed to prevent the leakage of the battery.
   
   
   
    
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 not suitable for use and storage in humid and corrosive gas environment to avoid damage to the machine parts.
   
   
   
    
4. Pay attention to dustproof: after use, should be put into the leather cover or plastic cover, to prevent dust invasion. If there is dust on the panel, use soft cloth to wipe gently, do not use gasoline, ethanol, banana water and other chemical test to wipe.
   
   
   
    
5. In case of external power supply, the pole xing and rated voltage shall be in accordance with the requirements of the machine.