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.

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WIDE COMPATIBILITY - Seamlessly connect with a variety of devices across multiple operating systems, including Windows, Mac, and Linux.
SMART CHARGING PORT - Charge your devices efficiently with a dedicated 5V/2.1A smart charging port that recognizes and adapts to your device's needs.
SLEEK STYLISH DESIGN - Elevate your workspace with a modern, glossy black finish that complements any professional setting.
SUPER SPEED DATA TRANSFER - Experience lightning-fast data transfer rates of up to 5Gbps, ensuring your files move at the speed of light.
INDIVIDUAL ON OFF CONTROL - Take charge of your connectivity with individual on/off switches for each USB port, giving you complete control over your devices.

The Tendak Smart Charger SuperSpeed USB Hub features 4 USB 3.0 data ports and 1 smart charging port, delivering rapid data transfer speeds of up to 5Gbps. With built-in surge protection and individual port control, this sleek and stylish hub is compatible with a wide range of devices, making it the perfect addition to any tech-savvy workspace.

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OS	Linux, Windows Vista, Windows XP
Product Dimensions	10.8 x 4 x 2.3 cm; 250 g
Item model number	CP-029-BK
Special features	Play, Plug, Powered
Other display features	Wireless
Colour	Black,Blue
Manufacturer	Tendak
Item Weight	250 g

Tendak Smart Charger SuperSpeed USB Hub with 4 USB 3.0 Data Ports + 1 Smart Charging Port (5V/2.1A) with 5V 3A Power Adapter Blue LED Switcher

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