Product Name: Bone Conduction Hearing Amplifier Fukumimi Bone Headphones Airy Model Number: USBFUKUMIBHA Size: Approximately 125mm (depth) x 100mm (width) x 45mm (height) Weight: Approximately 27g Materials: ABS resin, silicone Charging Method: USB AC power adapter (sold separately) or charging from a USB port on a computer, etc. Power Supply: Built-in lithium polymer (Li-polymer) battery Charging Time: Approximately 2 hours Operating Time: - Hearing mode: Approximately 6 hours (varies depending on usage environment) - Bluetooth mode: Approximately 10 hours (varies depending on usage environment) Network Compatibility: Bluetooth Included Items: Headphones hearing amplifier, charger + magnetic cable, instruction manual