... iso:9001:2008,rohs.fcca.icti.gsv promotional bass headphones specification: headphones sport: headphone&headset , computer headphone,headset,audio headset,super bass ... has 3.5mm audio jack, such as TV, DVD, computer, MP3,MP4 player,protable media player,language report,aviation etc ... main market:Europe,USA, ,Australia , Korea, japan,canada etc. promotional bass headphones promotional bass headphones