IMPRES RSM with NON-Threaded Audio Jack, Orange Button, Noise Cancelling (IP54)
NOT INTENDED FOR FIRE MARKETS
IMPRES RSM with Volume Toggle Switch, Orange Button and 1-Programmable Button, Windporting (IP57)
IMPRES RSM with NON-Threaded Audio Jack, Windporting (IP55)
Receive-Only Earpiece with translucent tube and rubber eartip (for HMN4104, HMN4103 and HMN4101 only)