Pro Intercom HS2TL Desktop Headset Station with Xenon Signal LampFrequency 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 system and sidetone levels do not vary as other stations are switched in and out of the circuit. The front panel contains controls for switching the microphone on and off, for controlling listening level, and for signaling. A recessed, screwdriver