Havit E553BT Open Ear Air Conduction Headphones, black

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