What do I need for CMRA to work? Team CMRA You need an Apple Watch (original, Series 1, Series 2 or Series 3) running OS 3 and an iPhone 5s or later running iOS 11. Related articles Why should I use CMRA? What do you mean by “Pre-order”? Is this “crowdfunding”? Who created CMRA? Is this Apple? What is CMRA? Is CMRA a smartwatch?