1.no Backlight, Keeps Displaying Last Content For A Long Time Even When Power Down. 2.ultra Low Power Consumption, Basically Power Is Only Required For Refreshing. 3.spi Interface, For Connecting With Controller Boards Like For Raspberry Pi/arduino/nucleo, Etc. 4.onboard Voltage Lator, Compatible With 3.3v/5v Mcus . Specifications : Operating Voltage: 3.3v~5v Interface: 3-wire Spi, 4-wire Spi Dot Pitch: 0.212 X 0.212 Resolution: 400 X 300 Grey Level: 2 Full Refresh Time: 4s Refresh Power: 26.4mw(typ.) Standby Power: Less Than 0.017mw Viewing Angle: More Than The170 Degree Colour:blue White Material:pcb Size:103 X 78mm Package Contents: 1 * 14.2 Inch E-ink Display Module 1 * Wire Only The Above Package Content, Other Products Are Not Included. Note: Light Shooting And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.