Can I Use This As An External Monitor With A Macbook Pro M1 Imac Intel 21 5 Emc 2389

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Can I use this as an external monitor with a Macbook Pro M1?

It’s not that simple You can’t use the iMac as a tethered display as is. You can use your MacBook remotely from your iMac so you gain the screen but this is a bit laggy. You could gut-out your iMac and convert it to a display using a conversion kit. Then it’s a tethered display.