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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. Micro USB for Soundsport Wireless or Soundsport. Pulse wireless headphones on the go. Wired charging. Built-in rechargeability extends listening time up to 18 hours. Compact and durable case protects your headphones while charging. A quick 15 minute charge provides up to 1 hour of playback. The case will be fully charged within 2 hours. LED indicators quickly display the status of both headphones and charging case. Before charging, please make sure the headphones are at room temperature between 5°C (5°C) and 40°C.