ear plugs Koken No.10 No.15 set Comes with original logo card

【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.

Material: No.10: Frequency (Hz) / Sound insulation value (dB) 125/17.5, 250/18.5, 500/25, 1000/27.5, 2000/29.5, 4000/29.5, 8000/30 No.15: Frequency (Hz) / Sound insulation value (dB) 125/16.5, 250/17.5, 500/17.5, 1000/22.5, 2000/29, 4000/30, 8000/29