1.ROHS, CE Approval 2.headset for call center and computer , headphone 3. jack can be customized headphone , headset for computer or call center1) Single side ear hook2) External appearance: black3) Ear hook can adjust, available for either left or right ear4) Earphone has volume controller and PTT buttonPacking: Polybags ROHS. CE. ISO9000:2001 Approval