Single iOS Device

You can use Air Chalk with a single iOS device. To do so, connect your iOS device to an external display (such as a projector) using a compatible accessory cable. Then, run Air Chalk, and the external display will show the content you write to your Air Chalk app.
(1) iOS device running Air Chalk.
(2) Accessory cable that connects the iOS device to an external display. Depending on your external display, you will need Apple Digital AV Adapter (which supports HDMI) or Apple VGA Adapter. Those adapter cables are available at Apple Store. After you connect the cable, Air Chalk will automatically find your external display.
(3) External display that shows your chalk board. For instance, you can use a digital projector.
You can check the display connection from Air Chalk: tap on the "i" button to show the Options screen, and select the "Display" tab.