Instruction: Answer the given question using the supporting document.

Input:
Question: Is the YN-560 II compatible and will it work on the Sony Alpha A99?
Document: This flash is awesome. I have 2 of this flashes for my Sony alpha a230, with remote triggers, and working very well in manual mode.
The order said  &#34;for Sony&#34;, the box said &#34;for Sony&#34;, but the product did not fit my Sony Alpha 77.
Received the flash and despite a label that reads &#34;for Sony&#34; it is not a Sony compatible flash. The flash I received is a Canon/Nikon compatible unit. a good friend has found use for it so I don't need to return it. Otherwise a great flash.
Nice strong MANUAL flash for my Sony. Works great and will work with a TTL light in S2 mode. The multi-mode is useless because it's too slow but other than that, this is a cheap flash that does put out a lot of power.
This is a must have flash that can shoot at 8fps can be a slave unit and it's really easy to work with. The guide number at 58 sends out a bunch of light so you can stop down the aperture to get a proper exposure and it works off camera as a slave unit.
I've used this flash on my camera and as a speed light. I took off one star because it was so difficult to set up as a speed light. I wanted to write this review to save someone else from the headache of trying to figure out how to make everything work together.
I've been getting a little more serious with my picture taking the past few months, along with Photoshop skills improvements. I started reading the Strobist blog about off camera flash photography, and suddenly a whole new world opened up! To help develop (pun intended) a better understanding of all this, an off-camera flash was needed, and this Yongnuo YN560 II fit the bill perfectly.
Learning how to use it in Manual but i love it highly recommend this product i have a sony a77 and it works great!
I chose this flash for my Sony DSLR as an alternative to the extremely expensive Sony flash.It works perfectly with my camera.
very good for the pricei use this flash with my sony a550and works very finei don't know to much about use external flashes but i'm trying to learn about.
Answer: Works great as slave or on-camera flash with my A65. "The A99's biggest hardware change from previous SLT models is the incorporation of a hotshoe that's compatible with the ISO standard allowing the welcome use of third party accessories. It still features a series of proprietary connector pins along its front edge, allowing use with Sony's flashguns and various accessories". I have not used an A99, but based on that article I would guess you would be fine.