Audio-technica's upgraded 4000 Series frequency-agile UHF body-pack and handheld Wireless systems bring outstanding clarity and versatility to live performance, regional touring, fixed installations and more. At the heart of the 4000 series is a rugged true diversity half-rack receiver, The aew-r4100, with 996 selectable channels offered in each UHF band. Receivers from both the 4000 and 5000 series may be linked; they may be monitored by the 5000 series system software. The included intelliscan feature automatically determines and sets the best available frequencies on all linked receivers. Multiple system configurations are available, with handheld vocal microphone/transmitters and unpack body-pack transmitters designed for use with lavalier, head worn and instrument microphones as well as electric guitars. Features: frequency agile: the system operates on UHF frequencies allowing greater channel select ability and range. The transmitter and receiver feature 200 user selectable channels diversity reception: The aew-r4100 receiver features dual internal receivers. The receivers relay between each-other, vying for the strongest reception while minimizing noise and signal drop-out Blue back-lit LCD: both receiver and transmitters feature a comprehensive, white over Blue background LCD display. The display provides radio frequency and channel information, battery and signal status intelliscan: the intelligent feature automatically locates and sets best available frequencies on all linked receivers specifications: type of receiver: dual independent receivers, automatic-switching diversity RF carrier frequency range: band C - 541.500 MHz to 566.375 MHz number of frequencies: 996 total per band (25 kHz increments) frequency stability: +/-0.005%, phase lock loop frequency control modulation mode: FM normal Deviation: +/-5 kHz operating range: 300' Typical frequency response: 70 Hz to 15 kHz signal-to-noise ratio: 115 dB at 40 kHz Deviation (iec-weighted), maximum modulation 75 kHz number of channels: 200 channels type of output): unbalanced: 1/4" Ts ("mono") phone jack, balanced: XLRM-type total harmonic distortion: =1% (10 kHz Deviation at 1 kHz) Sensitivity: 20 dB UV (S/N 70 dB at 5 kHz Deviation, iec-weighted) polar pattern: cardioid intermediate frequency: 65.75 MHz, 10.7 MHz audio output (attn switch at "0"): microphone: 25 mV (at 1 kHz, +/-5 kHz Deviation, 10K ohm load), instrument: 50 mV (at 1 kHz, +/-5 kHz Deviation, 10K ohm load) audio output attenuator (attn): three-position switch: 0/ -6/ -12 dB output connectors: microphone: XLRM-type, (balanced); instrument: 6.3 mm (1/4") TS unbalanced phone jack display: back-lit LCD display & battery/ signal status LED headphone output: connector: 6.3 mm (1/4") TRS ("stereo") phone jack, power output: 10 mW + 10 mW, T 1 kHz, +/-5 kHz Deviation into 32 ohms, maximum output, 220 mW + 220 mW into 32 ohms antenna power: DC 10v-12v, 20 ma (bnc-type jack) power supply: 100-240V AC 50/60 Hz, 8W operating temperature range: 5 deg. C (41deg. F) to 45deg. C (113deg. F) battery type/approx. Life: (2) 1.5V AA alkaline dimensions: 8.31x1. 74x9. 26"/ 21.11x4. 42x23. 52cm weight: 1.7kg/ 3.8lbs (without accessories).