For performers who wish to unplug from the wire, BLX Wireless Systems feature trusted Shure microphones and world-class design and construction. Available in bodypack and handheld configurations, BLX Wireless Systems built for legendary sound, right out of the box.The durable BLX4 features simple setup, intuitive controls, and microprocessor-controlled internal antenna diversity. One-touch QuickScan frequency selection quickly locates the best open frequency in case of interference.For use with BLX Wireless Systems.Main Features:XLR and ” output connectorsTwo-color audio status indicator LEDGreen: Normal audio levelsRed: Excessive audio levels (overload / clipping)Specifications:Output Impedance XLR connector: 200 6.35 mm (1/4) connector: 50 Audio Output Level Ref. 33 kHz deviation with 1 kHz toneXLR connector: 27 dBV (into 100 k load) 6.35 mm (1/4) connector: 13 dBV (into 100 k load)RF Sensitivity -105 dBm for 12 dB SINAD, typical Image Rejection >50 dB, typicalDimensions BLX4: 40 mm X 188 mm X 103 mm (H x W x D) BLX88: 40 mm X 388 mm X 116 mm (H x W x D)Weight BLX4: 241 g (8.5 oz.) BLX88: 429 g (15.1 oz.)Housing Molded ABSPower Requirements 1215 V DC @ 160 mA (BLX88, 320 mA), supplied by external power supply (tip positive)Specify Frequency when ordering:BLX H9 (512-542 MHz)BLX H10 (542-572 MHz)BLX J10 (584-608 MHz)