This is quite a nice kit to have and includes a self-contained Raspberry Pi 4 (Pi itself is not included) with a touch screen and battery power for around 5 hours. The battery is rechargeable, and all ports are accessible from outside, apart from the GPIO pins. The video shows how it all fits together and works.
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RasPad 3! Turn Your Raspberry Pi 4 Into a Portable Tablet!
by DB Tech on YouTube