Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Can this flash be set to rear curtain sync? I have a Canon 6D.
Document: Was wary buying what in effect seemed to be a knockoff canon product. Has exceeded my expectations in almost all regards. For the price, it has to be 5 stars, but it should be noted that the mechanism which locks the flash in place feels a little flimsy. I would be shocked if this lasts more than a couple years, but for the money paid, I wouldn't expect it to.
This flash is EXCELLENT! I love that it can be used as a slave based on seeing the flash of another unit - makes setting up a multiple off-camera flash system a breeze.The power is amazing, and it has good reach.The controls on this version are improved over the previous version as well.Love this flash with my Canon 60D.
I was skeptical about buying this flash at first but after reading the reviews, I decided to try it. And I'm glad I did! It's a great flash with an even better price! It syncs seamlessly with my Canon 60D! Programming from the camera menu is a breeze! I HIGHLY recommend purchasing this flash, the quality and price can not be beat! :)
I'm new to using a DSLR camera and straight out the box the flash was easy to use. However, it does not fit securely on my Canon 70D. It slowly wiggles its way loose even with my best tightening efforts. The flash even took a tumble off the hot shoe which I was not impressed with. Thankfully, it fell on carpet or this would have been a disaster.
I have not had any failures or issues on either of this model. I also use the Yongnuo radio triggers. The only issue I have had for the triggers has been operator error. I would accidentally change the channels and they would not work. Of course the first thought was the flash is starting to fail. Then I would check the triggers WHOOPS! OE.I am sure Canon could market theirs for less but heck why should they?
Amazing quality for the price. I have 2 of these (liked the first 565EX II so much, I bought another one!). 95% as good as the Canon 580EX II (only feature I see missing is HSS, which I rarely need-I use my Canon for that). Super versatile in ETTL or Manual modes. I use a Canon 70D and this flash is fantastic with it both on-camera and off-camera. Quick recovery time, works flawlessly with radio triggers.
I am a real estate photographer and reliability is a big issue for me. I had been using other flashes but they started to die one by one. I purchased this flash with much concern after reading the many negative reviews. Reliability was brushed aside in this case and I purchased the 565 EX II ETTL. for a Canon DSLR. Reliability took a back seat to the price difference between Canon and Yongnuo.I use flashes  heavily about 5-6 days a week for one to two homes a day.
&#34; It's great &#34; works better then my canon flash
I believe the Yongnuo flash is a great flash.It is a great value,however when I got the flash,my camera wouldn't recognize the flash.When I pushed the test button it wouldn't flash.I couldn't get a replacement.I  have to send it back for the seller to be evaluated and then get my refund which could take a month.Ironically I will have to reorder the flash because I believe it is a great flash.
Seems to work flawlessly. I read a TON of comparison reviews for the canon version and this. Does all that it says it does for less $. Would even buy again if money wasn't an issue. Works great.
Answer: Yep! You can set it to first, second or HSS