Sennheiser wireless microphones All model no: ew100/135g2/122g2/152g2/545g2/3000/5000 Ew-135g2: technical specification 1. Autoscan on all receivers for simple and secure frequency selection 2.1440 frequencies within a 36mhz switching bandwidth for greater tuning flexibility 3. Robust metal construction for durability 4. Pilot tone squelch(defeatable for backwards compatibility with original ew systems) 5. New battery concept(aa cells and rechargeable battery accessories) 6. Transmitter battery status telemetry on all models 7. Audio signal metering on transmitter lcd display 8. Xlr jacks on all rack-mountable units(including 100 series) frequency range : 518-866mhz maximum frequency deviation: 75khz audio frequency response: 40-18000hz dynamic range: 110db power output: 10 -30m w power requirement: transmitter: 3v receiver: dc-12/16v