FeaturesLow-profile iPhone mounting systemSwitch between a wallet, battery pack and fitness bandAccessories will still be compatible when you upgradeSimple twist and click connectivityAdapts to the demands of your dayThe protective slimline Nolii iPhone 11 Pro Max Couple Case lets you connect interchangeable accessories with a simple twist and click. Switch between a wallet, battery pack and fitness band to maximise the functionality of your iPhone and adapt to the demands of your day.Designing a strong lock that’s this simple, is surprisingly complicated. Meticulously designed in Nolii\'s London studio over two years, the patented Couple connector went through many rounds of prototyping. The result? The most low-profile iPhone mounting system in the world.Part of the Couple Family - Switch between a wallet, battery pack and fitness band to maximise the functionality of your iPhone and adapt to the demands of your day.And, when you need to upgrade your case? No problem. Your accessories will still be compatible, extending their lifespan.