Havit E553BT Open Ear Air Conduction Headphones, black

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