Bluetooth On-the-ear Headphones ZEALOT B20 Wireless / Wired Supra-Aural Earmuff Headset with Replaceable Battery(Silver) Bluetooth Capable, applying the latest version 4.1 for A2DP Profile. Headphones no power? Plug a standard 3.5mm AUX cable, it's Wired-Enable too! Dual large passive driver giving powerful bass response, and Supra-Aural design brings effective sound isolation Collapsible for easy storage, flexible and durable headband, protein leather ear cups allow prolonged use Rechargeable & Replaceable battery for extended use, Battery Model: Generic BL-5B Built-in speakerphone for hands-free calling, 650mAh Lithium-Ion rechargeable battery offers 10 hours talk time or music playback