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【Voltage Compatibility】 When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction. 【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary. 【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device’s requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product. 【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer. [World's lightest class, 3.8g lighter than paper] Introducing the world's lightest earphones, BLUTOOT, an innovation that brings music closer to you.With an ultra-lightweight design weighing only 3.8g, these wireless earphones are lighter than a single sheet of A4 paper, light as air, and fit gently in your ears.The wireless earphones have a weightless feel, ensuring comfort even when used for long periods of time, and allowing you to feel closer to your music.These are iPhone earphones that offer new freedom to your ears.