Arrived faster than expected. You need 2 AAA batteries for the installation. Then click the "Connect" button to connect with Bluetooth. It quickly connected to my Macbook. The overall size and shape/size of the keys are identical to the Macbook, so I'm very happy to get key covers for it. The keys aren't backlit like the Macbook, so consider getting a glow-in-the-dark band or under-lid glow-in-the-dark band. For $10 it's worth it. I can update how long the batteries last.
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