With the Send Message feature, you can display a custom message on a device. Please follow these steps to display a message:

1. In the HiddenApp dashboard, select a device.

2. Under Security Actions, click 'Send a Message'.

3. In the 'Send a Message' dialog box, type the custom message you want to display.

4. Select whether you want to send a spoken or written message.

5. Then click on the 'Send' button.