RDL PT-AMG2 Audio Generator Selectable MicLine Level InputOutput, Portable or Bench Operation Portable or Bench Audio Generator, Meter and Monitor Mic and Line-Level Audio Tone Oscillator with Metering Selectable Mic / Line-Level Input and Output Balanced and Unbal Connectorized Inputs/Outputs Operation from Standard 9 Volt Batteries or 24 Vdc