Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Does it work with a Nikon D3100 and a Yongnuo Speedlite YN560EX
Document: This is perfect for my off camera flash (d3100 camera with a yongnuo digital speedlite yn560-II). My flash in particular is very strong and produces great photos. I highly recommend!
This really had my hopes up. A fully TTL sync cable at a fraction of the nikon price. Sadly, I could not get it to work. I tried two flashes (sunpac 433 and nikon SB-600) with two cameras (D90 and D3100) but it would only function as a &#34;dumb&#34; cord (trigger only). I returned it.
Nikon charges a ton for this same cord. ***Here's WHY you want one. Don't own a Nikon Speedlite SB910 yet?....Thought so, this wonder cord allows as close to perfect compatibility, with Nikon dedicated Film flashes,(we have all been THERE), and any flash that I can think to want to ever use. Price, Pleae !!!! Its like free, for the money..
This product works great and is well worth the money! Fanta Sales was very helpful when I doubted if it would work on my Nikon camera and flash with an immediate response to my email.
It doesn't work. Flash still fully discharges and washes out everything. No TTL. I will not try to resolve this. I will discard the cable and bite the bullet and buy the Nikon. For some reason this knock-off product does not work. I should have heeded other reviews. DO NOT BUY THIS PRODUCT. I am going to revise the don't buy this statement.
The other available option is to use an L-bracket. The Vivitar, because of the shorter cord, will work better with an L than will the Nikon.Operationally, the Vivitar is great. The connections are solid. Slide the one end into the hot shoe and it stays securely in place using a flip switch, just like the one on the SB-600. The cord will stay in place through just about anything.
The Vivitar Flash Cord work as promised and appeared to be well made. The problem that led to a 2 star rating has to do with my application. I used the cord to connect a SB 910 that was mounted on a bracket to my Nikon D800. When working in the field with a 600 mm lens, I carry the rig over my shoulder when going from site to site.
I bought the Vivitar Flash Cord from Amazon some time ago. This Vivitar Flash Cord works well between Nikon D7100 and Nikon SB-700. But unfortunately, the Vivitar cord can not work between Nikon D7100 and Nissin DI866 Mark II. I have checked and find out the possible cause, the Vivitar Flash Cord has dimension problem on the contacting spots.
Thought on first look a great buy, the cord seems well constructed and fit all areas good. One problem it doesn't work in TTL mode on my Nikon D3200 and Sunpak PZ40X, Flash will fire perfectly attached to the hot shoe but put the cord between the camera and hot shoe, nada. Go figure. Sent it back today and will have to find another cord.
I bought this to use with my camera and an Adorama Heavy Duty L-bracket with 2 Standard Flash Shoe Mount, the part that goes in the flash shoe mount, the tightening mechanism will not fasten in the shoe mount tightly, renders it useless as it cannot secure the flash properly in the shoe mount. Other than the mounting issue it seems to work perfectly with my nikon d7000 and flash.
Answer: I use sb 400 n it wrks fine