?The stereo headset is foldable£¬ convenient to storage and with CSR Bluetooth V4.0£¬ connect with two phones at the same time. <br><br><strong>Features:</strong>? <br>You must connect your phone with Bluetooth. <br>The product with microphone£¬ convenient to use. <br>Stretchable and foldable headband. <br>CSR Bluetooth V4.0£¬ connect with two phones at the same time. <br>Built-in microphone and speaker£¬support digital signal processing echo cancellation technology. <br>Battery capacity display£¬ support for iPhone and some Android mobile phone Custom Pairing Name and Boot Vioce Prompt. <br>Deep Bass Surround Sound Effect: Equipped with high fidelity 30mm Professional Speaker Drive Unit£¬ Through Professional Engineer High?fidelity powerful bass stereo surround sound effect output. <br>Made of high quality material£¬ durable. <br>It is foldable£¬ convenient to storage. <br>It has high quality sound£¬ enjoy your life. <br><br><strong>Specifications:</strong> <br>Material: PC <br>Color: Black£¬ White£¬ Blue£¬ Red£¬ Golden (Optional) <br>Bluetooth: CSR 4.0+EDR <br>Loudspeaker Frequency Response: 110GHz ? 20£¬000GHz <br>Transmitting power: Glass2 <br>Spport Headset &amp; Handsfree Profiles <br>Loudspeaker Diameter: 30mm <br>Loudspeaker Impedance: 32ohm <br>Battery Model: Lithium polymer battery? <br>Music Playback Time: 4-6 hours <br>Talk Time:6~8 hours <br>Charging Time:2hours <br>Charging Port: Micro USB Type? <br>RF Range :10M <br>Microphone Sensitivity: -42 dB? <br>Battery: 250mAH <br>Item weight: Approx. 106g / 3.73oz <br>Package size: Approx. 16.3 * 11.5 * 5cm / 6.4 * 4.5 * 1.97in <br>Package weight: Approx. 257g / 9.loz <br><br><strong>Package including:?</strong> <br>1 * Bluetooth headset <br>1 * USB cable <br>1 * User manual (English)