Titus Technological Laboratories ON AIR light provides the broadcaster and recording studio with a beautiful but practical means of indicating that a studio is in use. The TTL ON AIR light features a smoked glass window mounted in either a gold or silver frame which is attached to an oak mounting base. The warning "ON AIR" or "RECORDING" only appears when illuminated and is blacked out when not in use. The TTL ON AIR light uses high power LEDs . Class 2 wiring, using #18 to #24 gauge wiring directly to your audio console's relays, eliminates the need for special interface boxes.