Can an ipad or iphone w/ camera adapter otg host this hub when it's externally powered, or will they reject it with "device requires too much power"?

I use this USB hub with the external power source, and the Apple camera adapter, to connect my iPad Pro 9.7 inch to wired internet, by plugging my ethernet cable into a USB adapter that I plug into the USB hub. It works great. I can also plug my iPhone in at the same time and it will import pictures from my iPhone to my iPad. Or I can plug my Apple charging cable into the camera adapter and into the USB port at the same time I’m using the internet and it charges the iPad, as well. I’ve been using this setup for a year with no issues. The usb port’s power cable recently quit working, and I can still use the usb hub to access the wired internet on my iPad, but it drains the iPad’s battery quickly. I’ve never received any notifications saying “device requires too much power” but maybe I’m using the USB port differently than other people. I’m buying this USB port again.

What is the size of the barrel for the power cable on this hub?

A 3.5 x 1.35mm barrel jack fits into this hub. (I tried asking Tendak directly and they didn't reply.)

Can you safely use the power port on the end of the unit to daisy chain two of these hubs?

no, the power port is only useful when you want to charge a usb device like an iphone, galaxy, etc. it doesn't allow data to pass through it - only electricity.

What is the input for the adapter? would it work outside usa, where the input is about 220v?

If the unit is 110v - 240v then you don't need a switch, just the proper wall adapter for the country you're in. Some appliances are 110 - 120v only in which case you would also need a voltage convert along with the wall adapter otherwise you would burn out the unit. I travel overseas a couple of times a year for years so I'm familiar with the situation.

Brand	Tendak
Manufacturer	Tendak
Series	CP-029-BK
Product Dimensions	10.8 x 4 x 2.3 cm; 250 g
Item model number	CP-029-BK
Is Discontinued By Manufacturer	No
Color	4-Port USB 3.0 Hub
Item dimensions W x H	10.8 x 4 x 2.3 cm
Voltage	5 Volts
Power Source	AC Power Adapter
Operating System	Windows XP
Are Batteries Included	No
Item Weight	250 g

USB 3.0 Hub, Tendak USB Hub with 4 USB 3.0 Data Ports + 1 USB Smart Charging Port and Power Supply Adapter with Individual On/Off Port Switches for PS4 Pro PS4 Slim Xbox One

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