TAPaulk's LITE Series listen only earpiece offers a discrete listening environment for a price that can not be beat. For use on TAPaulk's or other brands speaker mics and and can be connected directly to certain two-way radios. Comparable to much higher brand models, the TAPaulk™ JH-617-1 is a great choice for any user! Product Specs Competitive price Rugged Kevlar™ coiled PU cable 2.5mm angled plug 12 inch strait cable Field replaceable tube Speaker Specs Speaker size: 13mm Impedance:32ohm Frenquency response: 20-20KHz Sensitivity: 84db.