Vocopro IR90091 Infrared Dual Wireless Microphone System

2 microphone channels with individual volume controls utilizes infrared ir technology, effectively eliminates signal interference two sets of ir frequencies available; use up to 4 microphones at once large on-board ir sensor for superb reception includes 1 additional external ir sensor for increased range and signal strength in large rooms use up to 3 ir sensors simultaneously individual 1/4 output for each microphone signal mixed output for combined microphone signal operates on 2x aa batteries per microphone optional rechargeable kit available includes a charging dock and rechargeable batteries