Two to Four-person intercom with radio interconnect and new digitally controlled VOX system. Connect your two-way radio and allow up to Four users’ control over one radio. That’s right! This intercom offers radio transmit control at all four positions! The 710 provides louder and clearer audio than ever before. Internal microphones gain adjustment control over all intercom gain, and internal radio gain adjustment controls transmit audio from your connected two-way radio. A 9-pin Molex accessory connector provides AUX IN and AUX OUT connections in addition to cell phone speaker and microphone connections.