Remote stations call to master with momentary electronic tone and LED, remaining lit for 20 seconds. Press-to-talk communication at master, hands free at remote station. Flush mount (IE-JA-LD), or surface mount (IF-DA-LD) remote stations. Available in 3, 5, 10, 20 station sizes and systems up to 80 stations with LAF-C-LD system. Surface mount (LEF) or semi-flush mount (LEF-C) with simple wiring: 3 conductors to each remote.