Koss | BT221i | Headphones | Wireless | In-ear | Microphone | Wireless | Black

<b>Battery</b> Continuous audio playback time: 6 h Battery technology: Lithium-Ion (Li-Ion) Rechargeable battery: Yes Battery type: Built-in battery <b>Headphones</b> Headphone sensitivity: 101 dB Headphone frequency: 50 - 18000 Hz <b>Other features</b> Cord clip: Yes Buttons quantity: 3 2.5 mm connector: No <b>Packaging data</b> Package height: 152.4 mm Package weight: 152 g Package depth: 66.7 mm <b>Performance</b> Product type: Headset Headset type: Binaural Recommended usage: Sports Product colour: Blue Product colour: Black Wearing style: Ear-hook Volume control: Buttons <b>Ports & interfaces</b> Connectivity technology: Wireless USB connectivity: No Bluetooth version: 4.2 3.5 mm connector: No Bluetooth: Yes <b>Safety warning</b> Warnings: Do not disassemble or modify the product yourself. Warnings: The product contains batteries which must be disposed of correctly. Warnings: Read the user manual before use.