The 4ISSM speaker microphone is a large sized, heavy duty speaker microphone that has an auxiliary NATO headset jack fitted to the top. Our range of accessories fitted with a NATO suffix connector can be fitted to enhance useability in specific applications. When the headset is fitted the built in speaker and microphone is disabled. The large 50mm diameter black PTT button allows ease of use even when wearing gloves, it also has a smaller latching PTT button which is compatible with VOX on some radios. It has an adjustable steel lapel clip that gives a reliable strong grip. This is available for all radio platforms. This unit is fully sealed from Dust and Water ingress and features not only replaceable, but interchangeable cable assemblies.