The optional Yapalong 4000 open mic "Boom Mic III" headset is a combination of great sound quality and wear comfort. Dual-pin audio plug - 3.5 and 2.5 mm stereo (two prongs). In-ear tip can effectively block noise while provide good volume. It has 3 customization / adjustment features.
 
Ear mount: left ear or right ear
Concha support: short or long
In-ear tip: small, medium, or large
 
SHIPPING: 4-6 business days, via UPS Ground