Bogen TNG1 Tone Generator Module (for Bogen Matrix Systems)Bogen's advanced plug in modules provide a wide range of functions to support a variety of applications. These modules support different signal source requirements, including the ability to interface to balanced and unbalanced high and low level inputs, stereo or mono, telco systems, and microphones. Features: Select 4 of 8 tones to trigger 512 Hz Burst steady, slow whoop, siren, mechanical bell, Klaxon, night ringer, double chime, & doorbell tones