BRAND: Rugged Radios
It will even link with Avcomm, Racing Radios, Track Scan, Racing Electronics, and many other 3-pin linkable headset intercom systems.
The perfect companion headset for 'listen only' situations.'Features a 3.5mm scanner/music port with a coiled 3.5mm mono cable and single volume control knob.'24 dB NRR rated, the H40 is a popular choice for many enthusiasts.