Sound one sp-6 sport hifi stereo bluetooth headphones -unique neckband design for sport conveniently -ultra light weight for wearing more comfortablely -high quality sound and enhanced bass effect for clear talk and wonderful music buttons: -Press the button '-' to decrease the volume or change to next music -press the button '+' to increase the volume or change to previous music -press the phone button to answer ,reject ,pause ,transfer and finish calls pairing mode: Press the power on button until the reminder voice rings or the red and blue light flashes alternately pairing: A. Pressing phone button to power on your headset for 3-10 seconds,bluetooth headset can be paired when the red and green instruction light flashes alternately. B. Opening the bluetooth of your cellphone,then searching for the headset and pair. C. Power off your headset and keeping the cellphone connected. D. Pressing phone button to power on your headset for 8-10 seconds again,opening your second bluetooth devices and pair with the headset. E .Keeping your headset connected with the second devices,pairing again with the first devices directly,then your bluetooth has finished connection of 2 devices at the same. Specification: Bluetooth version: V4.1 transmission distance: Up to 10m (30feet) bluetooth profiles: A2dp, avrcp, hsp, hfp,spp talk/music playtime: Approximately 8 hours standby time :180 hours charging time:2 hours charging voltage:Dv 5v output 150ma what's in the package? 1 x sound one sp-6 bluetooth in-ear headphones, 1 x micro usb charging cable, 4 pairs / 8pcs ear-tips, 1 x user manual.