Open Settings → General → About. Check Model Name, then tap Model Number to see the A-number. For example, iPad Pro 11-inch 2nd Gen (2020) uses A2228, A2068, A2230 or A2231. iPad 11th Gen / A16 is a different model.
Browse compatible accessories for MacBook Air USB-C. Check the model and what is included with your device before choosing extras. Charging speed depends on your device, cable and power adapter.