Sennheiser EW-D EM (R4-9) Single Channel Receiver Wireless Microphone System Versatile and feature-rich digital wireless system for those who sing, speak or play instruments that allows for seamless product pairing and management via the EW-D Smart Assist App. Receive state-of-the-art live sound. Raising the bar Evolution Wireless Digital breaks the boundaries by providing more dynamic range than any wireless system currently on the market. Automatically securing the most reliable signal in a matter of seconds and scalable up 90 channels thanks to 56 MHz of tuning bandwidth, it?s easy to see why this wireless system is in a class of its own. Equidistant Spacing ? simpler than it sounds Evolution Wireless Digital features an equidistant tuning grid previously only found in our flagship Digital 6000 and Digital 9000 wireless systems. Quality components with exceptional linearity eliminate intermodulation between EW-D transmitters, allowing frequencies to be equally spaced every 600 kHz alongside each other. This simplifies frequency coordination for wireless beginners and seasoned professionals alike, and also contributes to the system?s scalability and impressively high channel count. An engineer in your pocket The power of Bluetooth Low Energy puts full control right in the palm of your hand with the Sennheiser Smart Assist app. Take advantage of a remarkably fast automated setup, mobile access to every system setting and the added benefit of remote monitoring, all from the convenience of your Android or iOS device. Save time, save energy and perform with confidence. Features: Digital transmission operating in the UHF spectrum greatly enhances range, reliability and scalability Smart Assist App connects via Bluetooth Low Energy for a streamlined setup and operation at a distance Auto scan creates reliable connections with minimal time and effort 134 dB audio input dynamic range eliminates need for sensitivity adjustments and preserves every detail Elimination of intermodulation enables channels to be placed in an equidistant tuning grid 600 kHz apart 56 MHz of tuning bandwidth and equidistant spacing enables up to 90 channels 2,240 selectable frequencies allow for fine tuning Lithium-Ion battery pack (sold separately) delivers up to 12 hours of operation (up to 8 hours of operation with 2x provided AA batteries) Specifications: Frequency range 1785.2 - 1799.8 MHz 925.2 - 937.3 MHz 823.2 - 831.8 MHz 863.2 - 864.8 MHz 630 - 662 MHz 552 - 607.8 MHz 520 - 576 MHz 470.2 - 526 MHz 606.2 - 662 MHz 662 - 693.8 MHz Dimensions 212 x 44 x 189 mm THD, total harmonic distortion ? -60 dB for 1 kHz @ -3 dBfs input level Weight approx. 1000 g (without antennas and power supply) Operating temperature -10 C - +55 C (14 F - 131 F) Current consumption ? 300 mA Input voltage range 11 - 13 V ? Transmission power BLE: max. 10 mW EIRP Operating relative humidity 5 - 95 % (non-condensing) Audio frequency response 20 Hz - 20 kHz (-3 dB) @ 3 dBfs Audio output level 18 dBu max. What's in the Box: EW-D EM rack receiver 2 rod antennas power supply with country adapters rackmount set 4 rubber feet quick guide safety guide manufacturer declaration sheet Echotone Music LLC is an experienced E-commerce Audio Visual Equipment dealer since 1998. We take pride in selling Pro Audio gear for musicians, sound engineers, production companies and broadcast applications. Shipping --Pro packed shipped USPS, UPS or Freight Service. Contact us pay for 2 day air upgrade on any unit. We are working hard to get your product ( built if needed), processed shipped. Processing times vary, 2-30 days Returns/Refunds- If there is truly a manufacturing defect a return tag will be provided. Otherwise customer pays for return shipping. Returned items must be sealed/unopened to qualify for a full refund. Refunds are for the Item cost only. Gear returned with out all its original packaging, accessories or shows signs of wear, is subject to an additional service fee. This item is now used and it would be unfair to resell to another customer as new. What products can not be returned? - Clearance items, Custom Builds, items identified as non-returnable, discontinued items, used or NOS items, electronic software downloads, demo gear, computers, vacuum tubes, earbuds, harmonicas raw-frame speakers, drumheads, drumsticks, turntable cartridges, fog fluids