AKG Pro Audio C555 L High-Performance Head-Worn Condenser Microphone : Everything Else - Amazon.com
C555 L - Datasheet
Amazon.com: AKG Pro Audio WMS420 Headworn Set Band A Wireless Microphone System with SR420 Stationary Receiver, P420 Pocket Transmitter, and C555L Headworn Microphone : Musical Instruments