Student calculator with emergency button, MP4, support music, video, images, textbooks, textbooks, textbooks, textbooks

Please read the text, images, and videos carefully before submitting the order to ensure that this is the product you need. If you have any questions, do not hesitate to contact us to resolve them, both before and after purchase. Do not choose to return or refund directly because our products contain batteries and it is difficult to send them back directly to my country. Therefore, many machines have been destroyed and we lost shipping costs, product costs, customs duties, local return fees, local return inspection fees, and destruction fees, among other things. We have lost a lot of money, and in the future, we may have to stop shipping to countries with local return services or close our store. Our calculator is a product developed on an mp4 player with calculator function, and it is not very powerful or perfect. Therefore, many images cannot be displayed directly on the calculator, and these images are likely to be blurry. Our calculator does not support all images, and images must be processed before placing them. Our calculator does not support all images, and images must be processed before placing them. First questions: Why is the image blurry 1. Our screen resolution is, so the best image size is * 240 pixels, and it is natural to display it on a computer. If it is text, please choose a darker font and a thicker line, and adjust brightness and contrast after taking a screenshot, because everyone's computer is different, so you need to adapt and try yourself. 2. If the image is relatively large, it should be cropped into multiple images, and 240 * pixels is the best. If you think the cropped image is too small, you can also crop it into a 4:3 aspect ratio image, and * 480 pixels is the best size, then view it after zooming in, sometimes you need to adjust contrast and other image parameters yourself. 3. Settings-Display-Backlight Brightness-5 is good 4. About the image, the calculator without privacy film is better than the calculator with privacy film 5. Each image is different. If you see that the image on the calculator is unclear, do not hesitate to contact us and send the image you need to place in the calculator, and we will test it and provide some suggestions. Second question: The buttons are heavy. Our buttons are made of silicone, there will be a conductive sheet under each button, it is necessary to press the button firmly so that the bottom of the key contacts the motherboard, which has the benefit that the key sound will be relatively small, but it also has a drawback that the key needs to be pressed with some force so that the conductive sheet can contact the motherboard. Third question: How to change the language Settings-Language-then choose your language, on the calculator interface, press the shift key and the power button to turn off, then press the power button again to save the language settings. There is only one warning: restoring factory settings changes the language to default. Fourth question: Are external memory cards supported? 64GB memory card supported at most. Fifth question: The calculator, rough craftsmanship and outdated technology Our calculator is developed based on an mp4 player, and it cannot be compared to a mobile phone or tablet. If you need good performance, please choose directly a mobile phone or tablet, because these products are widely designed and produced, and the appearance technology price is very good. Our calculator, the quality is the same as a regular mp4 player, it is not very good, and not bad. If you have aesthetic requirements, please do not choose the calculator, thank you! Sixth question: Why does it not work on Android system, no network, and SIM card is not supported? Yes, our calculator is developed based on an mp4 player, not Android. No network, no SIM card support, app installation is not supported, PDF, Word, and Excel files are not supported. Seventh question: The difference between the calculator with privacy film and without privacy film, and how to choose If you need to protect your privacy, please choose a calculator with PF, but this calculator will be very dark. If you need to watch videos and images more clearly, we recommend a calculator without PF. If you have any questions, do not hesitate to contact us, and we will reply within 24 hours. Please do not purchase without our response. Thank you. At the same time, we welcome wholesale traders to contact us. If you are a wholesale trader from a country with local return service, please contact us and we will do business with you and close sales to your country. H800 mp4 calculator with emergency button Item 1: Calculator (built-in 4GB memory) Item 2: From + 64G: Calculator (built-in 4GB memory + 64G TF card) Item 3: From + PF: (built-in 4GB memory + privacy film) Item 4: Case PF + 64G: (built-in 4GB memory + privacy film + 64G TF card) Functions supporting student calculator as colleagues: 1. Supports DRM music WMA OGG APE FLAC etc 2. Supports video RM AVI MKV VOB MOV FLV ASF DAT MP4 3GP MPG mppeg etc. 3. Text (ebook) supports only txt 4. Supports images: JPEG BMP GIF PNG TIF 5. Calendar 6. FM (need to connect wired headphones before trying, headphones must be purchased separately, we do not sell headphones) 7. Voice recorder 8. Emergency button ("=" button) Languages: supports languages including: Simplified Chinese, Traditional Chinese, English, Japanese, Korean, French, German, Italian, Dutch, Portuguese, Spanish, Swedish, Czech, Danish, Polish, Russian, Turkish, Hungarian, Romanian, Arabic, Houbri, Thai, Indonesian, Greek. After payment, you can receive the package in about 10-60 days. If you have any questions, just contact us freely. If you have any other questions, just contact us freely. Shipping Thank you for choosing our products, now we can send products worldwide by airmail, and it will take about 10-60 days, Brazil needs more days, if you need our products urgently, DHL Express, and we will offer a discount on DHL costs, we will update a new DHL template around May. 2, so if you place an order before May. secondly, please place your order, and we will adjust the DHL cost for you within 24 hours. We support online wholesale sales if you need more than 4 at once, please place an order, and we will offer a discount and adjust the total price for you. The photos are taken by myself, no further processing, so they are not very beautiful, more realistic is what we want. Your satisfaction is our pursuit, if anything makes you dissatisfied or angry, please contact us directly before leaving a bad comment. We will do our best to resolve the issue until you are satisfied.