Universal E-Paper Driver Board With WiFi / Bluetooth SoC ESP32 Onboard, Supports SPI E-Paper Raw Panels, E-PAPER ESP32 DRIVER BOARD, Comes with Android APP An To Display Images On E-Paper From PC / Smart Phone Via WiFi / Bluetooth Features At A Glance: -Paper ESP32 Driver Boardis a wireless solution for refreshing e-Paper display content, suitable for applications such as: supermarket price tag, e-Card, serial port monitoring, etc. Onboard ESP32, supports For development Provides Android APP, allows to refresh display content via Bluetooth Provides HTML host code, allows to refresh display content via remote webpage, suitable for Internet applications Supports Floyd- dithering algorithm, more color combinations, better shadow rendering for the image Supports popular image formats: BMP, JPEG, GIF, PNG, etc. Comes with development resources and manual Specifications: WIFI PROTOCOL: 802.11b/g BLUETOOTH PROTOCOL: Bluetooth 4.2,including traditional BR/, and low power BLE INTERFACE: 3-wire SPI, 4-wire SPI (default) OPERATING VOLTAGE: 5V OPERATING CURRENT: 50mA ~ 150mA LOW POWER CURRENT: Less than 2mA (cut off power supply for CP2102) DIMENSIONS: 29.46 x 48.25mm Transmitting Image Via Bluetooth Comes With Android APP, Easy To Use for reference only, e-Paper display is NOT included. Resources for different product , please check the page to confirm the actually provided resources. Color: Blue Material: PC+metal Package Contents: 3 x Universal e-Paper ESP32 Driver Board Only the above package content, other products are not included. Note: Light reflection 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.