The Raspberry Pi will need to be powered and plugging it into a wall outlet may not be possible in the place where you choose to conceal it. This is where a USB power bank can help you out. The Raspberry Pi is powered through a micro USB port, which can be connected to a battery. This can enable you to operate your remote testing kit for hours without the need to plug it in. This scenario was tested with a 6000mAh power bank, and it was able to run with the RPi and the attached Alfa USB wireless adapter for nearly 8 hours. Your mileage may vary and larger power banks are available out there, but this is a viable way to be able to drop off the Pi in the morning and complete your penetration test before having to retrieve the unit from the target.

It can be a little bulky if you have a larger wireless adapter, Raspberry Pi, and a battery to run everything; however, it's a great addition to your penetration testing tool kit.

Now that you have Kali loaded on your Raspberry Pi, configured to call home once it's connected to your target network and powered by your power bank, you can go about disguising it so that it isn't immediately identified as a threat.