【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. Power supply: DC3.7V: Built-in rechargeable lithium-ion battery Charging time: Approximately 2.5 hours (full charge) Charging method: USB charging Battery duration (continuous audio playback time): Up to 7.5 hours Battery duration (continuous talk time): Up to 7.5 hours Battery duration (standby time): Up to 200 hours Model: MEMS Directional characteristics: omnidirectional Effective frequency band: 100Hz-8,000Hz Maximum communication distance: line of sight approximately 10m