Can this product do This : connect to a wifi network wirelessly (for example a caravan park that supplies wifi) then can i connect to the device,

Yes it can. I am presently using one to connect to a wireless network and then hook up to an ethernet only PC to give internet connectivity. Set it to WISP mode. One word of caution, the PC in my instance required to have DHCP enabled - which Windows 10 connection troubleshooter did for me. After that it works perfectly and allows said PC to also hook up to a couple of wireless printers. In this mode, as well as allowing an ethernet connection, it also creates its own wireless network separate from the main wireless network which any wireless device in range - phones, tablets, laptops - can see. Useful for a pub or restaurant wanting its customers on a separate wifi for the business.

Does this item work with public wifi networks that require browser based authentication?

There is a way round this but it does require you to be tech savvy.This can receive and repeat Wi-Fi signals.You need to write down the mac address of your tp link then turn it off.Use a piece of software on your laptop to change your laptops mac address to that of the tp link.Log into public/hotel Wi-Fi, do the login page etc.Turn Wi-Fi off then change your mac address back.Turn the tp link on and set it up to connect to the Wi-Fi. Set a different ssid for your sub network then as long as your tp link stays connected you can use multiple devices.This is how I use my chrome cast and tablet etc in hotels

will this product work with the Huawei E3256 Dongle?

Yes if plugged directly into the router but not if you use a USB extension cable. This is a pain as an E3231 will do. I think this has to do with the E3256 being dual-channel and needing more power than the MR3420 can provide over an extension cable.

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Description

🚀 Stay connected, secure, and in control—your ultimate 4G Wi-Fi hub!

ALWAYS ONLINE DUAL BACKUP - Automatic 3G/4G and WAN failover ensures zero downtime for your home or office network.
BLAZING 4 G LTE COMPATIBILITY - Seamlessly share 3G/4G mobile broadband with up to 32 devices—stay connected anywhere, anytime.
EFFORTLESS SECURITY AT A PUSH - WPS button enables instant WPA/WPA2 encryption—protect your network without the hassle.
EXTENDED WIRELESS RANGE SPEED - 300 Mbps speeds with robust signal penetration—perfect for large apartments or steel-reinforced offices.
BANDWIDTH CONTROL FOR POWER USERS - Administer and prioritize bandwidth per device to optimize performance and productivity.

The TP-Link TL-MR3420 is a sleek, dual-color 3G/4G wireless N router delivering up to 300 Mbps speeds. It supports LTE/HSPA+/UMTS USB modems, offers 5 fast WAN/LAN ports, and connects up to 32 devices simultaneously. Featuring automatic 3G/4G and WAN backup, one-touch WPS security, and bandwidth control, it’s designed for seamless, always-on connectivity in homes and small offices.

Specifications

Brand	TP-Link
Product Dimensions	28.8 x 22.6 x 7.1 cm; 270 g
Batteries	1 Lithium Ion batteries required.
Item model number	TL-MR3420
Manufacturer	TP-Link
Series	TL-MR3420
Colour	Black, White
Standing screen display size	6.9 Inches
Processor Count	1
Computer Memory Type	DDR3 SDRAM
Memory Clock Speed	1800
Connectivity Type	Wi-Fi
Wireless Type	802.11n
Number of USB 2.0 Ports	1
Number of Ethernet Ports	1
Voltage	220
Wattage	3600
Power Source	9VDC / 0.85A
Operating System	Linux
Battery description	9VDC / 0.85A
Are Batteries Included	No
Lithium Battery Energy Content	2 Milliampere Hour (mAh)
Lithium Battery Packaging	Batteries packed with equipment
Number Of Lithium Ion Cells	5
Number of Lithium Metal Cells	5
Item Weight	270 g
Guaranteed software updates until	unknown

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