How many separate monitors/ displays can my 2013 MacBook Air support?
How many separate monitors/ displays can my 2013 MacBook Air (serial no. C0****F57) support?
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Check video support under technical specifications on the product-ID page
MacBook Air https://support.apple.com/HT201862
Click on this link to read how to 'Use external monitors with your Mac' --> https://support.apple.com/HT202351