What do I need for CMRA to work? Team CMRA You need an Apple Watch running OS 4 or higher and an iPhone 5s or later running iOS 11 or higher. Related articles Where can I buy CMRA? Why should I use CMRA? What do you mean by “Pre-order”? Is this “crowdfunding”? How does CMRA connect to Apple Watch? How can I check the status of my pre-order?