I'd like to know if the ports that are toggled on stay on if you cut and restore power to the entire hub? Critical for my potential use, but unclear.

They are mechinical push buttons which retain their state regardless of power.

No mention of circuit or voltage or surge protection in the product ad, is this correct?

Do not believe it has surge protection. Puts out standard usb voltage - about 5 volts. Works great. You can turn each port on or off individually.

How can 15 watt power supply be enough power for 10 USB ports when each port requires about 5 watts each?

Standard USB power is output at 5v (0.5A) not 5w, at this range the high average for the ports would be 2.5 Watts +-. But it is also not meant to have all ten running at once, hence the on/off buttons. and only 1 is meant for charging even though the other can and will charge.

Why do all powered USB hubs insist on useless power switches and sleep disrupting lights?

I found the separate power switches to be very useful as I can load the hub with peripherals and turn on only the ones I need at any one time. The lights allow me to know when something is operational and I have made it a habit to turn them off when I close down for the night. If these aspects bother you, why not turn all switches on and cover them with a cloth and secure it with tape or other material? Then all are hot and dark. Of course you may have to unplug some peripherals if they draw too much power instead of just turning them off.

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Brand	WENTER
Manufacturer	WENTER
Model	KDP-AF120300U
Package Dimensions	24.3 x 10 x 4.9 cm; 420 g
Item model number	KDP-AF120300U
Hardware Interface	USB 3.0
Compatible Devices	USB-Flash-Laufwerke
Special Features	Powered
Number of items	1
Batteries Included	No
Batteries Required	No
Data Transfer Rate	5E+9 Bits Per Second
Number of Ports	11
Total USB ports	10
Manufacturer	WENTER
Item Weight	420 g

Powered USB hub

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