The lightweight IS-RSM2.1 remote speaker microphone is specifically designed for PTT applications. With its robust housing and secure ISM interface, this unit is an ideal complement to our IS330.1 and IS530.1 mobile units.

Cerificates 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 NEC500 beantragt Class I, II, III Div. 1 Groups A B C D E F G T4

Dimensions Weight: 215 g, Dimensions: 115 x 70 x 25 mm

Connection ISM interface, via the spiral cable

Power supply Via the connected device

Loudspeaker Dynamic, three fixed volume levels Sensitivity: 85dB (1mW) Bandwidth: 50Hz … 8kHz

Microphone Electric, Omnidirectional Sensitivity: -38dB + 3dB (1kHz) Bandwidth: 50Hz … 16kHz

Degree of Protection IP54 Operating temperature -20 to 60 °C

Other PTT button

Other products

The new generation Zone 1/21 and Cl I Div1 touch-tone phone with Bluetooth® 5, large 64 GB internal memory, multifunctional ISM interface, SOS button and reinforced loudspeaker.


The IS530.1 is the first Bluetooth® 5 industrial smartphone with multifunctional ISM interface, large 64 GB internal memory and the highest camera resolution in its class.


The powerful 8″ tablet for use in Zone 1/21 and Cl I Div1. It is highly robust and offers many technical advantages such as Qualcomm Snapdragon SDM 660, NFC, Android™ 9.

Staff-eye GmbH, 2020