The "Lightning-3.5mm headphone jack adapter" (hereinafter referred to as the earphone conversion adapter) that came with iPhone 7 to iPhone X is no longer included with the iPhone 11 series. However, if you have an iPhone running iOS 10 or later with a Lightning terminal, you can still use the earphone conversion adapter.
Since the earphone jack was abolished in iPhone 7, wireless / Bluetooth earphones have been very popular, but there are many functions that make wired earphones more popular. Earphone conversion adapter is one of the means to use this wired earphone with the latest iPhone.
One of the advantages of wired earphones is the processing of audio signals. Bluetooth earphones always go through the process of compressing / decompressing the audio signal, but the earphone conversion adapter receives the uncompressed digital signal and converts it to an analog signal with the built-in small IC (LAM, Lightning Audio Module). Then, it is amplified and transmitted to the earphone terminal. The signal of Bluetooth earphones deteriorates in the process of compression / decompression, but the earphone conversion adapter is theoretically not deteriorated because it is fully digitally processed.
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The other is "less delay". For apps such as shooting games and music games where the timing to measure the user's reaction is important, such as tapping the screen, the delay is fatal even if it is several tens of milliseconds. Bluetooth earphones are inevitably delayed due to the process of compression / decompression, which is a disadvantage compared to earphone conversion adapters that have almost no delay.
Another advantage is that it does not need to be charged. Bluetooth earphones require regular charging and will not work if the battery runs out. Many people may find the earphone conversion adapter easier to handle in that it reduces the number of devices that require power management by one.
