The hottest thing in the world of smartphone accessories right now is an iPhone BlackBerry-style keyboard case. It resembled the sharp keyboard styling of older BlackBerry smartphones and incorporated a number of screen-and-hidden extras that give a new dimension to the user experience.
First of all, this case connects directly to the iPhone's Lightning or USB-C port. Thus, there is no need for Bluetooth connectivity to operate or include a separate battery.
In this way, it derives its power directly from the phone, and you need not worry about an extra charger backup.

Here's the Rundown on All These Special Features of Blackberry-Style Keypad for iPhone
Backlit Keyboard
The backlight allows for typing in the dark or low light.
The installation is done in such a way that it is not visible from outside; the case looks very regular outside, but inside shines bright.
Shortcut keys support
The keyboard accepts iOS shortcuts like CMD + H (return to home screen), CMD + Space (iOS search), etc.; they enrich the ordinary text input.
Using These May Let You Carry Out Activities Without Having to Touch The Touchscreen
Scroll mode using keys
Two rows of certain keys located on the top of the keyboard are designed in such a way that they can be used to scroll through web pages or documents — a sort of shortcut scroll feature.
Readable and textured grip pad
A sort of soft (vegan leather) grip pad on the back of the case holds the phone firmly and also gives a sound feedback.
Sometimes the balance of the phone easily gets lost — this problem has been very effectively addressed.
Firmware updates and app integration
In the future, there will be an app that will allow for keyboard firmware updates, new shortcut settings, and key remapping.
That is an "evolutionary" device — a device that will be better over time.
Pass-through charging
You can charge the phone even if you have a case on — the keyboard case has a pass-through port.

Conclusion
You wouldn't have to open the case to charge, as you are using the case in this way. So the new BlackBerry-style keyboard case is no longer just a "retro gimmick" — it becomes an efficient productivity tool with all these functionalities as extras in disguise.
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