Motorola PMLN6127 IMPRES 2-wire Surveillance Kit, Black, with C-Hook Earhanger (Replaces RLN5880) for MotoTRBO XPR/APX Series, PTT-MIC Combo, Enhanced Audio, Intrinsically Safe - IS (FM Approved).    

Allows private messages to be received for hands-free discrete communications. 

Compatible with the MOTOTRBO XPR series and APX series portable 2-way radios.

The IMPRES audio feature optimizes your audio when operating in noisy environments. 

Intrinsically Safe refers to equipment that is designed and certified to eliminate or encapsulate any components that produce sparks or which could generate enough heat to cause an ignition in areas with flammable gasses, dusts or fuels.