Memobird has a feature called important message. Unlike the normal message, when you send an important message you can get a notification if the recipient receives your message. Below I will show you how this feature works.
The sender sends an important message
Write the message, tap preview, tap important, tap print.
The recipient receives the important message
Once the recipient receives your message, the Memobird will print out the message and the button will be flashing orange light with beeping a sound until the recipient press the Memobird light button to confirm the message.
The sender receives a confirmation
Once the recipient presses the Memobird light button, the sender will get a notification. That way you can be assured that they have received your message.