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Technical Data

Technical Data
type IS-RSM2.1
size 115 x 70 x 25 mm
weight 180 g
Power supply Over the connected device
IP54 Operation range from -20 °C up to 60 °C
Connection ISM interface
Cable length Spiral cable
Microphone Electret, Omni-Directional, Sensitivity: -38dB ± 3dB (1kHz), Bandwidth: 50Hz … 16kHz
Loudspeaker Dynamic, 3-stage volume control, Sensitivity: 85dB (1mW), Bandwidth: 50Hz … 8kHz


Included remote speaker microphone,
quick start manual and safety instructions

The lightweight IS-RSM2.1 remote speaker microphone is specially designed for PTT applications. With its robust housing and safe ISM interface, it is an ideal addition to our mobile devices IS330.1 and IS530.1.


  • loud speaker dynamic & 3-stage volume control
  • power supply over the connected device
  • push-to-talk
  • intercom and volume control


  • ATEX zone 1/21
    II 2G Ex ib IIC T4 Gb
    II 2D Ex ib IIIC T135°C Db
  • IECEx zone 1/21
    Ex ib IIC T4 Gb
    Ex ib IIIC T135°C Db

  • CSA
    Class I, II, III Division 1 Groups A B C D E F G, T4
    Intrinsically Safe MOBILE, ATEX certification MOBILE, IECEx certification
Ex zertifiziert