Soondar Mini Rechargeable Li-on Battery Wireless Bluetooth Stereo Earphone Compatible with any Bluetooth Enable Devices - Black Constantly working time after full charge: about 3 hours. This Bluetooth headset offers you the wireless freedom, this gives you the most comfortable wearing experience. This Stereo Bluetooth headset makes the noise reduction and echo cancellation for streaming music from your phone or tablet. NOTE: Please don&amp;#39;t stop pressing the power button until the led light blinks red and blue by turns. Then you can try to connect the headset with phone via Bluetooth. Please long press the button to turn off the earbud for energy saving. Bluetooth Version: Bluetooth V3.0+EDR, compatibility with V2.0 V1.2. & Apple iPhone 6/6 plus/5s/5/4s/4, Samsung Galaxy S5/S4/S3/S2/NOTE3/NOTE2, iPad Air/4/3/2, HTC, Huawei, Sony, Mobile Cell Phones, Laptop, Tablet, Any Bluetooth Enable Device