They are pure charging USB ports without data connection.

Since the HUB is connected to the PC, I think not.

Do you need the device only for charging? If yes, why you take not directly one that makes only this. The possible max power output should be bigger with one of this. https://www.digitec.ch/en/s1/producttype/mobile-device-power-supply-463?pdo=1221-15988%3A584404%7C1221-15988%3A584400%7C1221-15988%3A584402&tagIds=77-100

It would have to check to be 100% sure, but from the top of my head (how i remember it at home) its at the back right.

No. When the power is off, the data lines are also off.

7 USB 3 ports (but not Type-C) for data + 2 ports on the side only for charging devices (the hub powered by a transformer)

The power unit is quite large at: 9x5x3cm and when plugged in, overhangs the neighbouring power socket(s) by 6.5cm Hope this helps!

A plug-in power supply unit is included for the CH

According to my information, the product is also compatible with USB 2.0 ports. Not all functions may be supported, as when you do not connect the hub to USB 3.0 ports.

I don't have a PS4, so I can't test this specifically. In my case, the hub is connected to a Windows 10 PC and what I can say is that I can operate both an external HD and the Bluetooth mouse receiver and a few sync cables to mobiles in parallel and cannot detect any differences in performance compared to the direct UDB connections of the PC. It's actually the first hub I have where I could also plug in the mouse receiver, otherwise the mouse only ever worked satisfactorily when connected directly to the PC.

1 metre

I don't know which tablet you are referring to, but it has worked for me before.

This is the on/off button - it must be accessible because the hub is always switched off when the PC is switched on.