Sub Monitor
The JB-2HD is the sub monitor for the JB series open voice color video series. The unit connects to a master JB-2MD and an additional JB-2HD sub monitor. (or JA-2SD audio only sub). The unit features a 3-1/2" TFT color monitor, a TALK button for PTT or VOX activate communication, a door release button, call-in LED's, door chime and communication volume controls and brightness control.