This study aimed to improve the speaking skills of twelfth-grade students at SMK Labschool Tangerang Raya through the implementation of WhatsApp voice note. To achieve this objective, the researchers employed technology-based media to support the teaching and learning process. The WhatsApp voice note feature was utilized as a Mobile-Assisted Language Learning (MALL) medium in instructional activities. This study employed a Classroom Action Research (CAR) design conducted in two cycles, with each cycle consisting of two meetings involving seventeen students. Data were collected through classroom observations, speaking performance tests, and questionnaires. The speaking assessment was conducted through storytelling performances using a scoring rubric based on pronunciation, fluency, intonation, and accuracy. The results indicated a consistent and gradual improvement in students’ speaking abilities, particularly in terms of fluency and pronunciation accuracy. In addition, the students demonstrated increased engagement during classroom activities. There was an increase in students’ average speaking scores from 36.76 in Cycle 1 to 43.38 in Cycle 2, with a mean gain score of 6.62 points. Questionnaire findings also indicated increased student engagement during speaking activities using WhatsApp voice notes. The reflection from these findings suggest that WhatsApp voice notes can support the improvement of students' speaking skills in EFL classrooms.
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