Rolls RS81B Quartz PLL Synthesized AM/FM TunerThe RS81B is a single rack space Phase Lock Loop digital AM FM Tuner designed and built for professional applications such as remote radio station trucks and repeaters, church and school installations, as well as night clubs and restaurants. Features: Up to 30 FM and AM stations may be stored. RDS ( Radio Data System) Display. Retains presets when power is off. Large LCD digital display. Auto Search function. Standard 1 space EIA rack chassis. 3. 5mm