iPad Air 2 from circa 2014. It works perfectly. Wifi. 128GB. White front and silver in the back. The battery life is not so great, and there is some visible wear, but I used it with a cover on so it’s very clean. The charging port (Lightning) works with no problem. iPad Air 2 is an older model, so it doesn’t have the native "Battery Health" percentage menu like newer models. Just for an example, if you are using this all day, by the end of the day you’ll have less than 20%.
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