| Signalling |
| The fully compliant MPT signalling package includes MPT1343, Regionet 43 and ANN modes of operation. Radios are configurable for up to 2 personalities including Talkgroup Select or Conventional signalling. |
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| X-Pand™ Voice Compression and Low Level Expansion |
| Crisp, clear and strong audio quality in virtually any noisy environment. Low level expansion allows further improvements in audio quality by reducing noise usually heard during pauses in conversation. |
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| Dynamic Regrouping |
| Provides over-the-air reconfiguration of the radio. |
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| Missed Call Alerts |
| The radio can store an incoming call and prompt the user to return the call they receive. |
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| Voice Recorder |
| A paperless notepad allowing you to store and retrieve messages. |
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| Voice Messager |
| A voice prompt for callers to leave a message to be stored in the radio. |
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| Option Board Expandability |
| You can expand the capabilities of GM640 by adding an option board. |
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| Wideband and Programmable Channel Spacing |
| Provides flexibility in deployment and stocking. |
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| Time-out Timer |
| Limits the amount of time a user has to continuously transmit on a channel. This allows for more efficient use of the channel. |
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| External Alarm |
| Activates the vehicle horn and/or lights on receipt of an incoming call, so you won’t miss a call even when away from your vehicle. |
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| Car Radio Mute |
| Automatically mutes your in-car audio entertainment system to allow calls to be heard and sent without interference. |
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