Havit E553BT Freego Pro Open Ear Air Conduction Headphones, green

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