What do I need for CMRA to work? Team CMRA You need an Apple Watch running OS 3 or higher and an iPhone 5s or later running iOS 11 or higher. Related articles Why should I use CMRA? What do you mean by “Pre-order”? Is this “crowdfunding”? Where can I buy CMRA? How can I check the status of my pre-order? How does CMRA connect to Apple Watch?