The condition is that he must be sane and Muslim, even though the purpose of the adhan is to announce?
Machine translationRead the Arabic original
The questioner : Yes, the condition means that the one calling the adhan must be sane and Muslim, even though the purpose of the adhan is to announce.
The Shaykh : In any case, even the announcement is achieved by the sound of a car.
The questioner : Yes, Shaykh.
The Shaykh : The adhan is a remembrance of Allah (Mighty and Majestic), and the people whose necks will be longest on the Day of Resurrection are the mu'adhdhins, so it is among the least of deeds.
The Shaykh : In any case, even the announcement is achieved by the sound of a car.
The questioner : Yes, Shaykh.
The Shaykh : The adhan is a remembrance of Allah (Mighty and Majestic), and the people whose necks will be longest on the Day of Resurrection are the mu'adhdhins, so it is among the least of deeds.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 647 - الشرط لابد أن يكون عاقل مسلم مع أن المقصود من الأذان هو الإعلام؟ ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.