Pro Intercom BP1SL Switchable Single Channel Belt PackPerformance: The BP 1S L portable headset station may be worn on the belt or hung on the wall by its sturdy belt clip. Soft plastic strips on the underside help hold it in place when set on top of a console. The matte black finish minimizes visibility. Frequency response has been carefully shaped to optimize both intelligibility and long term listening comfort. A mic limiter circuit reduces overload distortion. The high bridging impedance ensures that