Features Specifications:Earphone  We have been engaged in producing earphones for 9 years and work together with a good and professional team! We are always ready to serve you with good quality production, smooth, quick and professional service and after-sales service! Let me know all you requirement, then we will do our best to meet you! We will be your good supplier for long-time cooperation!  FEATURES: driver unit: 10mm  sensitivity: 100db  speaker impedance: 32ω.  power handling capability:10mw  microphone:4.5*2.2mm-42db+/-2db  ear bud made in metal material