Features: Autoscan on all receivers for simple and secure frequency selection 1440 frequencies within a 36MHz switching bandwidth for greater tuning flexibility Robust metal construction for durability Compact bodypack transmitters and receivers(30% smaller than current EW) Pilot tone squelch (defeatable for backwards compatibility with original EW systems) New battery concept (AA cells and rechargeable battery accessories) Transmitter battery status telemetry on all models Audio signal metering on transmitter LCD display External charging contacts on 300 and 500 series bodypacks XLR jacks on all rack-mountable units