The IFBlue receiver provides simplicity and flexibility in a tough package that is intuitive for untrained users to operate. In spite of its small size, the receiver pack offers excellent performance and convenience. The dock charging feature and supplied rechargeable batteries make daily use a snap, while 10 programmable preset frequencies give you excellent flexibility on set or in the studio. The IFBlue receiver pack is offered in five different frequency ranges to match existing T4 transmitters: VHF (174-216 MHz), A1 (470-537 MHz), B1 (537-614 MHz), C1 (614-692 MHz) and 941 (941-960 MHz).Transmitters available from Lectrosonics include the IFBT4, IFBT4-VHF, or any Digital Hybrid Wireless transmitter in IFB compatibility mode.Main Features:Compatible with Lectrosonics IFB transmitters including Hybrid transmitters in IFB modeStores up to 10 frequency presets in memoryLCD interface for programming and operationHigh sensitivity for extended operating range indoors or outdoorsUSB port for firmware updatesCompact, rugged injection molded ABS housingAttached battery door2 AA batteries; alkaline, lithium, or NiMH rechargeables (supplied)Specifications:Frequency Selection Steps: 25 kHz; VHF: 125 kHzSensitivity: 1 uv (20 dB SINAD)Signal/Noise ratio: 95 dB A-weightedSquelch quieting: 90 dBAM rejection: 50 dB, 10 uV to 100 mVModulation acceptance: 20 kHzSpurious rejection: Greater than 70 dBOperating temperature range: -20 to 50 degrees C.Third order intercept: 0 dBmFrequency response: 100 Hz to 10 kHz, (+/-1 dB)Audio output: 1V RMS into 50 ohms minimumAntenna: Headphone cableMin. headphone impedance: 16.0 OhmsProgrammable memory: 10 frequencies can be stored as presetsControls:Top Panel: Single knob controls Audio Output Level and Power OnSide Panel: Membrane switches with LCD interface for Frequency Selection and Preset functionIndicators: Multi-color LED indicator for power on and battery statusBattery: Two AA batteries (+1.5 VDC each)Battery Life: 10 hours (Alkaline) 12 hours (NiMh), 20 hours, 40 minutes (Lithium)Current consumption: 120 mAWeight: 4.6 oz (130 g) with batteriesSize: 4.25 x 2.75 x 1.125 in. 108 x 70.0 x 28.5 mm