Features: 1.Working Principle: Electronic ink screen works on the principle that charged nano particles suspended in a liquid are subjected to an electric field and migrate, forming a display effect close to that of traditional printed paper by reflection under ambient light. 2.Wide Angle: Ink screen can be clearly displayed in the light, natural light and other ambient light, without backlight, the viewing angle of almost 170 degrees or more. 3.Applications: Ink display supports partial refreshing, low power consumption, wide viewing angle, and can still be clearly displayed in power outages for display applications such as shelf labels and industrial meters. 4.Compatible: Very low power consumption, basically only in the refreshing power consumption, can access for Raspberry, for Jetson, for Nucleo and other main control board. 5.Last Display Content: No need for backlight, power off can keep the last screen display content for a long time, comparable to the traditional paper display effect. specification:Item Type: 1.54in Electronic Ink Display Material: Electronic Ink, PCB Model: 1.54inch e Paper Working Voltage: 3.3V Grayscale Level: 2 Screen Size: 1.54inch Resolution: 200x200 PX Communication Interface: 3 Wire SPI, 4 Wire SPI Local Refreshing: 0.3s Global Refreshing: 2s Display Size: Approx. 27.0 x 27.0mm / 1.06 x 1.06in Viewing Angle: >170 Degree Display Color: Black, White PackageList:1 x 1.54in Electronic Ink Display Note1. The screen FPC line is fragile, pay attention to the use of the screen along the horizontal bending line, not along the screen vertical bending line. 2. Ink screen screen is more fragile, pay attention to avoid dropping, collision, press hard. 3. Note that the screen can not be a long time on the power, when the screen is not refreshed, the screen should be set to sleep mode, or power off processing. Otherwise the screen for a long time to maintain a high voltage state, will damage the diaphragm, can not be repaired. 4. When using the ink screen, it is recommended that the refreshing interval is at least 180 seconds, and at least once every 24 hours to do a refreshing, if you do not use the ink screen for a long time, the ink screen to brush white storage.