This device, equipped with the feature to assign functions to each button, offers the ability to assign different tasks to each function key. With the 3-digit numeric naming, users can easily define and quickly access each function.

The device has the ability to display 4 notifications simultaneously, allowing the user to respond to multiple notifications at the same time. Additionally, with 5 different melodies and English voice notifications, the device provides users with various sound options, making its usage more personalized.

In conclusion, this device equipped with these features and the ability to define 999 call button offers users both functionality and customization in one package.