Garmin handheld two way radio, compatible list:

Rino® 610

Rino® 650

Rino® 650t

Rino® 655t

Rino® 700

Rino® 750

Rino® 755t

Headsets and Microphones

This device is compatible with many headset and microphone accessories that connect using a 2.5 mm jack 

By default, the device is set to detect automatically when a new headset or microphone is connected.

NOTE: When connecting a headset with a push to talk (PTT) button, you must press the PTT button after connecting the headset for the device to detect the headset.

This device is compatible with Voice Operated Transmission (VOX) devices. These accessories allow you to use the device hands-free by transmitting automatically when a voice is detected. You can adjust the sensitivity level of connected VOX devices (Advanced Radio Setup).

Advanced Radio Setup

From the radio app, select Menu > Radio Setup > Advanced Setup.

Headset Type

Sets the type of accessory headset or microphone you are using with the device 

VOX Level

Sets the sensitivity of a connected Voice Operated Transmission (VOX) accessory. A lower VOX setting is recommended for quiet environments, and a higher VOX setting is recommended for noisy environments.