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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4-Port USB Power Hub with Unique 5V 3A US Power Adapter You can charge your phone even when the computer is off. Transfer speeds up to 5Gbps (500MBps) allow you to quickly move data between devices
1 x Smart charging port (up to 2.4A) for charging smartphone/tablet/camera etc. Automatically recognizes the device and provides the corresponding current. USB 3.0 Cable Length: 100cm / 39 inches, long enough to connect to the USB 3.0 port on the back of the desktop
Finished with a sleek piano black gloss UV clear coat with individual on/off ports. If you want to turn off any of these 4 ports, just hold the switch button for about 3 seconds. Turn on the USB port: tap the button
Smart USB 3.0 hub remembers which port is on or off when power off, and maintains its configuration when power on. No driver required, compatible with Windows XP / Vista / 7 / 8 / 8.1 / 10 / 10.1, Apple Mac OS X 10.2 or above, Linux 9 or above
Rugged construction, built-in surge protection, over-current protection Industrial grade 5mm hardened cable will last for years to come. Note: If the hub does not work, it may cause the voltage to be unstable. Please remove the power adapter

The Tendak USB 3.0 Powered Hub is designed to extend the USB connection of your laptop/computer. It has 4 USB 3.0 ports and 1 smart charging port. Specifications 4 USB 3.0 ports for data transfer, 1 charging port for cellphone/tablet etc. LED: Built-in 4 Blue LED Switcher: 4 ON/OFF Power Button Cable Length: 100cm / 39" Compatible Model: Windows 10.1/ 10/ 8.1/ 8/ 7/ Vista/XP/ 2000 and Mac OS X 10.2 or above/Linux 9 or above, USB Port Support: Backwards compatible with USB 2.0/1.x version. USB 3.0 USB 3. Data transfer rate: up to 5Gbps (10x faster than USB 2.0) Why need a 5V 3A power adapter? 1. USB 3.0 port on laptop/desktop only supply 900mAh current. More than one USB device is not enough. 2. Some devices require more power, such as external hard drives. One external hard drive requires a current of 0.5A to 1A. 900mAh will not connect other devices. 3. With the power adapter, you can charge your phone/tablet (need 1A for iPhone, Samsung) 4.Charge your phone even when the computer is off. If you don't have a power adapter, the USB hub will shut down when your computer is turned off. Includes: 1 x USB 3.0 Hub Power Adapter 1 Year Limited Warranty by Tendak Note 1. Some USB 3.0 devices and 2.4G wireless devices (such as wireless mouse, wireless keyboard) may not be compatible with the host USB 3.0/2.0 port directly. Includes 2.5V 3A power adapter. When charging multiple devices, the total current should not exceed 3A. 3. Do not connect multiple printers or scanners. Low power problems.

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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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