English pronunciation courses developed by California Accent TEFL are designed to be taught with a smart phone using a speech recognition app. This technique is used to confirm proper pronunciation. Note that most of these apps are designed to recognize American English with a neutral accent which is sometimes called a "California accent". Many of these apps are available for free and Thai students may already have one on their own phones.
Lessons in this curriculum series usually cover 20 target words. The teacher will ask each student to pronounce the target words correctly enough for a speech recognition app to recognize.