Bluetooth Headset & Hands-free, A2DP, AVRCP -92dBm RX sensitivity and +9dBm TX output power capability , 24 bit Audio codec, -98dB SNR lDC5V/100MA-1A , Charging time:last up to 2 hours Distance: 10M , Support: A2DP/AVRCP , Talk time: 4-5 hours , Play music: 3-4 hours Instructions: Power: Press the power button for 2-3 seconds, along with red and blue lights, boot into the back even state Power Pairing: Press the power button for 5-6 seconds, along with red and blue lights, after flashing red and blue alternately into pairing mode VOL +: Press the volume + button for 2 seconds, add up the volume a maximum sound, a warning sound VOL-: Press Volume - button for 2 seconds, cut down the volume a minimum sound, a warning sound. Previous: Press VOL+ Next: Press VOL- Telephone Answering: when to call, press the power button Refused to answer: when to call, press the power button for 2 seconds Redial last telephone number: double-click on the standby power button Charging: red light when charging, fully blue lights How to Connect the Headphones with Your Cellphone(for the first time): Open the Bluetooth function on your cell phone; Long press the headphones' answer button for 3 seconds. After hearing "power on" , don't release the button, continue to hold the button for 4 seconds. After a "beep" sound, when red and blue LED light flash alternately, it is turning into pairing mode. Use phone Bluetooth to find a Bluetooth device named "B3300", then select this device to pair. After pairing this device, Headphones will give a voice remind "connecting". Play music Long press the power/answer button, headphones will give a voice remind "Power off". No need to repeat all of above steps the next time to pair, you only need to: Open the Bluetooth function on your cell phone; Short press the answer/power button, after hearing "power on", release the button, then you will hear "connecting". Just play music directly.