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Multiple-Function Buttons You could press the "+" button in a short time to turn up the volume, yet you could press the "-" if you wanna turn down the volume. You could press the "+" button for a bit longer time to switch to next song. If you wanna switch to the previous song, the "-" button should be pressed. If you press both "+" and "-" simultaneously, it will be changed to silent mode. You can turn on the headphone by pressing another button shaped "phone" for 1 second. You can pair you Bluetooth headphone to your cellphone by pressing that button for 4 seconds. You can turn it off by pressing that button for 5 seconds. If you wanna refuse a call, you could press that button for 2 seconds. Powerful Battery With built-in lithium battery, the Bluetooth headphone could work for 4 hours and its standby time is around 200 hours. Specification Color: Black Bluetooth Version: 4.2 Transmission Range: 33ft Multiple-Function Button: 3 Charging Voltage: 5V+/-0.25V Charging Type: Micro USB LED: Blue/Red Bluetooth Character:A2DP/HFP/HSP/AVRCP