Description: 【Sturdy Material】: Crafted from metal, this air conduction headphone line ensures longevity and reliable performance for all your hearing assessment needs 【Optimal Length】: With an approximate length of 200cm, this headphone line provides ample reach and flexibility during use, making it convenient for various testing environments 【Standard Connector Size】: Equipped with 6.3mm TS and 4mm connector, it is designed to fit seamlessly with most audiometers and hearing devices, ensuring compatibility and ease of use 【Noise Reduction Capability】: Designed to minimize external noise interference, this headphone line enhances the accuracy of hearing screenings by providing clear sound transmission 【Versatile Application】: Ideal for use in audiology test or personal settings, this product is suitable for conducting air conduction tests and screenings efficiently   Size Chart: Adapter: 3.2mm/0.13inch Length: 200cm/78.74inch Package Includes: 1x Wire for Audiometer Earphone Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.