what speed are the ethernet ports 100MBps or 1GBps?

It is not 1gbps. It is 100mbps. I have the TL-R470T+ in hand and have tried it out and it is definitely 100mbps. If you have a faster than 100mbps broadband or ISP - you need a different product - try the TP-Link R600VPN instead. Ignore the product description on this page - it is wrong and I cannot get my money back as I have binned the packaging and now cannot do a return. Do not be me!

How does this handle streaming high definition video from the internet , e.g. 4k video stream.

The bottom line is it really depends alot on what you are actually doing and where you are getting the video from.I don't know what you know so I will spell it out.I am assuming that you are downloading video from You tube or Amazon prime or some such service. This is assumed to be a single point to point connection for download.AFAIK 4K Video is just a larger file than non 4k video and has nothing special about it in this context other than its data density per second of film is much higher.The router provides failover and load balancing for multiple ISP's. I have two and am adding a third. These are two very different things and the load balancing aspect of this router is probably not what you might expect or would want based on my assumption. What you probably want is what is called 'channel bonding' where two or more ISP's connections are made to act as if they are one single faster connection, and will otherwise smell, feel and act as if they were one connection. This router does not channel bond. It's load balancing provides a close alternative which you must understand to get its benefits.The actual ISP connections with this router are independent and used in isolation, or not, according to the routers set balancing instructions of which ther are 4 (2 * 2) major choices plus a few other minor varations. The router figures out how to use them according to your configured wishes. Balancing shares the ports out across all of its current connections, ths making it feel like you get 10Gb + 10Gb = 20Gb bandwidth when in fact you are effectiely using 50% less connections per port.Failover is used only when a connection was active on a now failed port and the router will automatically attempts a continuation of that connection on the other port. Sometimes this is not possible, as the protocol in use at the time may not allow that to happen. Skype is one example.A single connection is allways over ONE outgoing port route, or another, never over two or more. So as there is no channel bonding you cannot get an download speed advantege from this router, unless your video download is via some sort of torrent like service where parts of the feed come from several different remote addresses, each requiring additional connections for that sub part of the file, will you get any added bandwidth advantage at all. It can do that, and does it very well.This router is not all things to all men, but its the closest thing to heaven for my needs and now I understand how it behaves I have enough control and flexibility for most scenarios.

i bought this, could anyone please give me a step by step instructions for setting it up with two 4g lte sim card routers.

You need to download the manual from the TP-Link website as it shows the various protocols for connections

Is the connection failover on this?

Yes, in a way. To failover, we setup 99% balance main connection, 1% balance on the backup connection, so both are connected at once. Then, if the main connection fails, all usage goes to the backup connection.

Brand	TP-Link
Product Dimensions	15.8 x 10.09 x 2.54 cm; 684 g
Item model number	ER605
Manufacturer	TP-Link
Series	ER605
Colour	Multicolour
Wireless Type	802.11.be
Voltage	12 Volts
Operating System	Mac
Are Batteries Included	No
Item Weight	684 g
Guaranteed software updates until	unknown

SafeStream Busniess Gigabit Multi-WAN VPN Router, Supports IPsec/PPTP/L2TP, Up to 20 Ipsec VPN Tunnels, Easy Management (ER605)

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