

For almost 30 years, OTTO’s original, field-tested EvolutionTM speaker microphone has been a trusted standard for public safety and military service workers across the world. With a sturdy internal speaker and a sealed housing with a built-in debris screen, it provides a more natural sound.
| Country of Origin | United States (US) |
| ATEX Safety / Zone | Zone 0 |
| Hazardous Area Rating | Class 1 Division 1 |
For usage in hazardous environments, the OTTO Evolution Intrinsically Safe Remote Speaker Microphone is ATEX Zone 0, 1, 2, and Class 1, II, III, Division I-certified. As a last resort, the IECEx certification. With a customized environmental design that provides mobility and stability in everyday or aggressive settings, the Evolution speaker microphone may be used with a range of radio brands and models.
The Evolution speaker microphone is the recommended remote speaker microphone for public safety applications. Military forces, government security, and military police employ it for training exercises, event coordination details, and high-security operations that require absolute clarity and calculated safety.
For the speaker microphone to work, it must include the following components: an audio speaker, a microphone, a talk button, a volume control knob, an emergency switch, and a coiled cable to link them all. You can connect to an inherently safe radio using any of several options.
| Mechanical Specifications | |
| PTT switch life: | 1 million cycles |
| Clothing clip assembly: | 360º rotation with positive detent stops every 45º |
| Cable pull at either end: | 40 lbs |
| Flame resistant cable (select radio models) | |
| 24 month manufacturer’s warranty | |
| Environmental Specifications | |
| Operating temperature: | -30° C to +75° C |
| Storage temperature: | -40° C to +85° C |
| Complies with MIL-STD-810F spec, 40 mph blowing rain with cable attached |
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