AirPods (2nd generation) - Technical Specifications - Apple
AirPods can be used as Bluetooth headphones with Apple devices using earlier software and with non-Apple devices, but functionality is limited. Some features require iOS 13 or iPadOS, which are not compatible with iPhone 6 Plus, iPhone 6, iPhone 5s, iPod touch (6th generation), iPad Air (1st generation), iPad mini 3, and iPad mini 2.