Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Will this work with the earlier (version 10.7.5) of the mac air?
Document: I placed an order this summer for a charger for my mac book air computer. I love this computer and it is very inconvenient not to be able to use it. I ordered a new charger and was very excited to receive it in the mail. I was very disappointed when I realized it did not work. I had to go on Apple's website and order a new one there. So very disappointed.
Just got a new puppy that chew up my charger. I needed a quick replacement. My order arrived as promise. Work perfectly. My apple computer charge to 100% less than 10 minutes.
I was apprehensive that the power adapter would not work as well as the one included with my Mac, so I was pleasantly  surprised that the product was exactly the same. This was an easy and money saving way to buy Apple accessories.
Exactly what is described. Macbook Air charger and is a real Mac product!
Completely satisfied. Very good product and fair price. Works with my Mac book air from 2012. Thank you very much
I use this product everyday. Worked as expected charges my mac air. I would recommend this product for all apple users.
I am a recent purchaser of the New MacBook Air (sept 2013) and have fought with the idea of having a second power cord for travelling back and forth to work. I broke down and bought it this week, and as expected it is just as it is advertised, it is an Apple product and with that it comes with all the guarentees of Apple.
This is a real Apple branded power adapter for the MacBook Air. I bought it so I could leave one at my desk, and one in my laptop bag for traveling. This fits the application well, but I wish I had bought the larger 60W power adapter for MacBook Pro. The 60W will work just fine with the MacBook Air, but also work with the MacBook Pro. This adapter will only work with the MacBook Air, but is underpowered for the Pro.
I spent enough on my Mac Air without going cheap on the power supply. My cat chewed my original cable leaving to find a replacement. I was shocked at the cost of the OEM replacement yet there were so many bad reviews on the cheaper unapproved versions that I simply refused to take the risk. I got the original and am happy with it, albeit left feeling a bit ripped off on the price.
Extremely frustrating: apple has a way of making money through chargers for Macs and iPhones!!!!! Such good products and such poor revenue generating tactic. Just simply cheap.I had a macbook air two years old, and just bought a new one- The new computer charger is different than the last one, probably for one single reason: to make more money for Apple. This is very sleazy technique.I was excited to get the new Mac, but now am totally dissatisfied and furious.
Answer: As Steven said, the easiest way is to look at your your existing connector. If you have lost your connector, you can find out when your MacBook Air was released by doing the following:1) Find the your model number on the back of your MacBook    (For example, Model: A1466)2) Enter your model number in this website: http://www.everymac.com/ultimate-mac-lookup/.    You might need to cross-check your Processor, but that should put you on the right track. 3) Locate the production date for your model and processor4) Cross-check with this article in Apple Support: http://support.apple.com/kb/ht2346