Bluetooth Stereo X700BT Headset with Microphone

40mm Full Frequency Horn, better tuning, repeated calibration, so that the overall earphone hearing better, full bass, high-pitched bright, rich details in the ear beat.double connection ways. standard 3.5mm audio cable when the headset is out of power or when the device is not supported with bluetooth2.6cm stretchable headband: UP and freely adjust lifting comfort according to different head shapes.Dual battery life, balance left and right earmuffs. 500 mAh high capacity ,charging for 4hours ,  bluetooth work 22hours, not worries of the power.Bluetooth 4.2 chip, with 24Mbit/s high-speed transmission speed to ensure sound smooth and clear, stable data transmission, wide wireless coverage, low power consumption and compatible with all kinds of bluetooth devices.