Comparative Efficacy of Earplug Usage Instruction

The goal of this clinical trial is to learn whether video-based training or paper-based training is more effective at teaching correct earplug insertion technique, in hospital personnel at Maharaj Nakorn Chiang Mai Hospital who work in noise-exposed areas (e.g. laundry and kitchen units), aged 20-60 years. The main questions it aims to answer are: 1. Which training method ,between video-based and paper-based instruction, produces better earplug insertion skill immediately after training? 2. Is any improvement in earplug insertion skill sustained at 1-week follow-up? Researchers will compare a video-based instruction group to a paper-based instruction group to see if one training format leads to better and more lasting earplug insertion skill, as measured by a standardized 20-point observational checklist. Participants will: * Undergo a baseline history and ear exam (otoscopy) and complete a demographic questionnaire . * Have their baseline earplug insertion skill assessed by a blinded observer Be randomly assigned to receive either a 5-minute video-based or paper-based instruction on proper earplug use . * Practice inserting earplugs and then be reassessed immediately after training * Return after 1 week for a follow-up assessment to test retention of the skill

Inclusion Criteria: * Personnel aged 20-60 years old who report regular works in areas perceived as noisy department * Personnel who works at Maharaj Nakorn Chiang Mai Hospital, Faculty of Medicine, Chiang Mai University, during the year 2026. * Personel who is willing and able to participate in the study throughout its duration. Exclusion Criteria: * Individuals with active ear infections. * Individuals with ear canal stenosis that limit to insert the earplug. * Individuals with visual or auditory impairment that limit to read or see the instruction * Individuals who have limitation to use their hands to insert the ear plug.