Audio Input:Constant-voltage speaker line, transformer-coupled Input Level:Switch-selectable 25 V, 70 V, 100 V Detection Bandwidth:120 Hz to 7.5 kHz (-3 dB) Trigger Threshold:-40 dB to -15 dB (below 25 V, 70 V or 100 V), adjustable (single turn) Release Delay:3 seconds to 25 seconds, adjustable (single turn) Control Output:Open collector @ 25 mA (SLAVE terminal) Indicators (3):Power (blue LED), Threshold (red LED), Triggered (green LED) Power Requirement:24 to 33 Vdc @ 20 mA*, Ground referenced *plus load current connected to SLAVE output