Features: No backlight, keeps displaying last content for a long for time even when power down. No built-in battery, no worries about battery life. Ultra low power consumption, basically power is only required for refreshing. You can modify the display content by smartphone. brand new and high quality Due to the advantages like ultra low power consumption, wide viewing angle, clear display without electricity, it is an for ideal choice for applications such as shelf label, industrial instrument, and so on. Specifications: Material:PVB Display Size:57.29x38.19mm Dimensions:84.5x47.50mm Full Refresh Time: 6s for Grey Scale: 2 Display Color: Black, White Viewing Angle: >170 Resolution: 264 176 Dot Pitch: 0.217 0.217 Net Weight:210g Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x E-Paper Module