Product parameters Style: In-ear, Model number: K2, Chip: Britain imports CSR8670, Connectors: USB, Use: with a Bluetooth device, Communication: Wireless, Standby time: 30days, Continuous talk time: Up to 5 hours, Total talk time: Up to 40 hours, Listening time 2-3 hours,Listen to the song total time about 20 hours. Charging time: Bluetooth Headset Battery: 45 mAMobile power: 500 mABluetooth headset on the mobile power, automatic charging.Two headphones can be used alone.Open method: Binaural Bluetooth headset pairing connection is more complex, please refer to the manual patient operation.You can also give us email address, obtain the operation video.Ture on : When in the off working mode , keep pressing home key until blue indicator light flashes and you will hear turn on toneTure off : when in any mode , keep pressing home key until red indicator turns on for 2 seconds and will hear turn off tone .Bluetooth pairing(dual headphone)1. Select any one of the main ear headphone do , the other for the sub-headphone (inter changeable)2. Main headphone press 1-2 seconds , the boot (slow flashing blue light) , press 2 times quickly the button to enter the main pair of headphone like (red and blue lights alternately)3. Auxiliary headset press 1-2 seconds , the boot (slow flashing blue light) , press the button once auxiliary headset , primary and secondary headset automa tically paired (primary headset red and blue lights flash alternately to disapp ear , with the secondary headset with flashing blue lights)4. Master headset press 1-4 seconds to enter the mobile phone and headset pairing status (red and blue lights flash alternately)5. Open the phone s Bluetooth find Bluetooth devices , select k2 , the main headset becomes slow flashing blue lights , the connection is successful.