More Details:<br><br><br><br> Specifications:<br>          Basic Specification            Brand Name        HOCO            Model Number        EPB03            Bluetooth Version        V4.1            Bluetooth Protocol        HFPV1.6， HSPV1.2， A2DPV1.2， AVRCPV1.0， Dlv1.3            Battery Capacity        110mAh            Receive Power        -80 DBM            Transmission Distance        10m            Working Time        8 hours            Standby Time        4 weeks            Charging Time        2.5 hours            Cable Length        About 680mm            Cable Type        Cable Type: Avoiding winding dual color noodle cable            Driver        14mm aluminum coil            Sensitivity        -80dB&amp;lt;0.1% BER            Impedance        32&amp;Omega;            Frequency Response        20-20kHz            Microphone        Yes            Prompt Voice Language        English            Multi-point        Connect to two devices at the same time            Package Included        1 X HOCO EPB03 Bluetooth Headphone     3 X Pairs Earmuffs     1 X Ear Bag     1 X English\/Chinese Manual   <br> Operation Guide:1. With earphone turned off， press power\/pairing button until the LED flashed red\/blue. Activate Bluetooth pairing mode.2. Select &amp;quot;HOCO EPB03&amp;quot; from the list of the Bluetooth devices shown on your devices. If device asks for a passward， enter four zeros(0000).3. The headphone's LED will stop flashing red\/blue once successfully paired\/connected.