【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. Equipped with photovoltaic power generation that can be charged using sunlight or indoor light, so there is no need to regularly replace batteries. You can rest assured that it is water resistant to 10 ATM. The unisex design comes in two sizes, so it can be worn by a wide range of people, from children to adults. Set contents: Main unit - in original packaging, instruction manual, warranty included with instruction manual Country of origin: China Clock accuracy: Monthly difference ±30 seconds Operating time: Approximately 3.5 months on a full charge Smile Solar (photovoltaic)