Havit E553BT Freego Pro Open Ear Air Conduction Headphones, green

Ear coupling: Air conduction | USB Type-C ports quantity: 1 | Product colour: Black | Bluetooth version: 5.3 | Volume control: Button | Connectivity technology: Wireless | Wearing style: Neck-band | Headphone frequency: 20 - 20000 Hz | Product colour: Green | Width: 105 mm | Control type: Buttons | Length: 140 mm | Talk time: 9,5 h | Recommended usage: Music / calls | Bluetooth: Yes | Weight: 23.1 g | Headset type: Binaural | USB charging: Yes | Continuous audio playback time: 16,5 h | Height: 57.3 mm | Battery capacity: 110 mAh | Product type: Headset | Microphone type: Built-in | Battery recharge time: 2 h | Package contents: Headphones | Bluetooth range: 10 m | Warnings: Keep away from children. | Driver diameter: 15 mm | Warnings: Regularly check the condition of the batteries to prevent leaks. | Warnings: Do not use near sources of heat or flame. | Input voltage (earpieces): 5 V