7.3" ACeP 7-Color ePaper Display Module (800×480) _ARD_SHIELD_ROBOTICS H2 Signal Measurement Range: 0

H2 Signal Measurement Range: 0 ppm to 1

Power switch operation Power on: Press the power button for 2 seconds

you can also connect the rings of different diameters together

The user guide can be found here

7.3" ACeP 7-Color ePaper Display Module (800×480) _ARD_SHIELD_ROBOTICS H2 Signal Measurement Range: 0This 800x400 E paper display module has advanced colour ePaper technology which makes it a more comfortable read than a conventional display, due to a stable image, not having to be refreshed constantly, a wider viewing angle, and the fact that it reflects ambient light rather than emitting its own light. Thanks to its low power feature it can retain text and images even when the power is off. With an SPI control interface to use development boards