Audix AP42 C210 Combo Wireless Microphone System | Frequency: B (554-586 MHz)A dual channel system that combines the OM2 handheld transmitter with the ADX10 cardioid lavalier system. This is a very efficient and cost effective solution for combining the hands free convenience of a lavalier with the flexibility of a handheld mic. The package is ideally suited for presentations, meetings, or events where the lead speaker remains in control while the handheld microphone is passed around either on stage or in the audience.