On the connectivity front, it supports dual-band 802.11ac wireless networking and Bluetooth 5.0.
It is also completely compatible with previous Raspberry Pi products.
you might download Kali Linux for the Raspberry Pi 4 on theKali ARM download page.
The installation process of Kali Linux ARM architecture on Pi4 is similar to that of Pi2.
Those who do not know how to set it up, can follow theinstructions hereto get started.
source: www.techworm.net