WAVESHARE 2.9inch E-Paper Display E-Ink Display, 296x128, RedYellowBlackWhite, SPI Interface 1. Operating voltage: bare board version: 3.3V; Module version: 3.3V5V 2. Communication interface: 3-wire SPI, 4-wire SPI 3. Display colors: red, yellow, black, white 4. Grayscale levels: 2 5. Fast refresh: 11 ms 6. Full refresh: 16 ms 7. Refresh power consumption: 30 mW 8. Sleep current: 0.01 μA (near 0) 9. Viewing angle: 170° 10. Resolution: 296 x 128 pixels 11. Display size: 66.89 x 29.05 mm 12. Dot pitch: 0.135 x 0.135 mm 13. Size: bare board version about 79 x 36.7 x 1.2 mm, module version about 89.5 x 38 mm Features: 1. No backlight required; the last displayed content is retained for an extended period after power is cut off 2. Extremely low power consumption; power is consumed primarily during refresh cycles 3. Comprehensive supporting documentation provided (driver board schematics, example programs for Raspberry Pi Jetson Nano Arduino STM32 ESP32, etc.) 4. The module board features an SPI control interface, allowing connection to host boards such as Raspberry Pi, Jetson Nano, Arduino, STM32, and ESP32 5. The module board includes an onboard level-shifting chip, making it compatible with both 3.3V and 5V microcontroller interfaces 6. Suitable for retail price tags, asset and equipment tags, electronic shelf labels, and conference name badges, among other applications