Main features

• Low power sleep at  ~3uA .
• Use CR2016 battery
• Custom font
• 3D printed case and key chain .

Hardware

• Display 1.54 inch display . More detail here
• MCU: Texas Instruments MSP430G2553IPW20R  (TSSOP-20)
• 32.768 kHz crystal for accurate time keeping.
• Flash chip:  NOR Flash SPI  32Mb (4M x 8) .  Tested GD25Q32CTIGR,W25Q32JVSSIQ,BY25Q32BSTIG
• The necessary components plus 24 Position FFC, FPC Connector for the epaper display.
• Extra reset switch and mode switch.
• Header to flash the MSP430 and serial (UART) for debugging and uploading to the NOR Flash chip.