I pretty sure the keypad is not a repeater.
It’s not only the distance but also objects (walls, bricks, granite, etc).
For me, I had to use 4 extenders in my one story house and 30 ft was sometimes too far especially with walls in between. Also keep in mind that in order to have a device attach to a new/moved extender you need to take the battery out to reset it. You basically have to keep moving the extender around to different plugs and resetting the device to see if you can find a “sweet spot”.