Im searching for this tool... that can make us use 2 headset at the same time while using 1 phone... theres this thing that can connect 2 headset but i dont know the name...

I know it first when i watched school 2013 if im not wrong... 2 girls wear headset like how i describe earlier... n i already search on google n cause i dont know the name i just write how to use headset for three people lol

Please someone... maybe in your country theres such tool? >< it will get lonely if theres three of us n only 2 can hear music while the other is abandoned T-T