This is a QAZ Keyboard case combined with a tablet holder, mousepad and a pen-rail to use it as a modular cyberdeck. Your tablet must be maximum 9mm thick to fit. For the usb-connector you have to solder ~8cm usb cable with 2 sockets (https://aliexpress.com/item/1005005461853645.html and https://aliexpress.com/item/1005005334574996.html (male). The PCB is traymounted with 3x6mm self cutting screws.
For the rubber feet version you can use 10mm diameter rubber feet (https://amzn.eu/d/fdjHScY)
The powerbank holders only fit the INIU 65W 25000mAh Powerbank (https://amzn.eu/d/evioG2V)
QAZ PCB here available: https://www.cbkbd.com/product/qaz
The author marked this model as their own original creation.