1/8in/3.5mm plug No batteries needed,just plug and go Light weight, ... music Name: GEP3 Fashion stereo music headset with 3.5mm input jackModel No.:GEP3Feature:1/8in/3.5mm plugNo batteries needed,just plug and goLight ... ,MP4,Ipod computer headsets , DJ headphones GEP3 Fashion stereo music headset with 3.5mm input jack