国产成在线观看免费视频成本人,欧妇女乱妇女乱视频,亚洲欧美日韩一区在线观看,综合偷自拍亚洲乱中文字幕

Recently, the LCD electronic tablet on the electronic market seems to be very hot. As a senior user, I will explain its use and principle here:

一、First, the use of flexible liquid crystal pressure sensing technology, the display principle is to reflect the outside natural light, will not produce any radiation.

二、Does not affect the student's vision and protect the eyes. The writing is bright and soft, not glaring, and reading is effortless.

三、No pen, no electricity, one button to clear, can be written with your fingers or any hard object, no dust pollution, health and environmental protection, but also saves teaching costs.

This product has been extensively researched among school teachers, children and parents, and has been highly recognized. The general response products are simple and practical, efficient, convenient and intelligent. The popularity is beyond expectations. Bringing innovative elements to more users, further improving and improving the educational environment, and more serving education and serving the society.

四、 Built-in single-grain CR2025 button battery, the service life can reach 3-5 years, can be repeatedly refreshed 100,000 times 0.019 mW / cm 2, drive time 1.05 seconds, power consumption is only spent on the screen refresh.

五、 Background color, black, display color white green.

六 、Reflectance: 20-30% The product does not need to be backlit. When the external light is stronger, the displayed content is clearer.

七 、Writing strength: less than 300G.