Welcome to The Cool Life! I am a seller in Japan. I ship authentic products from Japan. Please enjoy shopping with peace of mind! You will find great products! 【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. ・Ultra-compact and lightweight body design 40% smaller body size than WFM4 Realizes comfortable wearability and improved wearing stability that reduces fatigue even when worn all the time ・High noise canceling performance Equipped with the same integrated processor V1 as the WF-1000M4 Achieves high noise canceling performance despite being small and lightweight ・High external sound intake performance Significantly increases the amount of intake compared to previous models.You can listen to music while listening without removing the earphones. ・High-quality call performance Achieves high call quality with high-precision voice pickup technology Achieves call quality that exceeds that of previous models ・Easy to use and individual optimization Automatic control function, high performance, drip-proof IPX4, 3D sound compatible Equipped with various usability features In addition to being noise-cancelling and high-resolution compatible, they are the world's smallest and lightest (*) design, and by reducing the amount that protrudes from your ears, the center of gravity of the earphones is close to your head, ensuring stable wearability. In addition, we have adopted an ``ergonomic surface design'' that increases the contact surface between the earphone itself and your ear. The shape makes it difficult to interfere with the complex unevenness of the ear, making it comfortable to wear even for long periods of time.