WIRELESS FREEDOM, MADE SIMPLE. The ideal entry-level wireless microphonesystem for small venues. BLX Wireless Systems provide professional-qualitysound with simple setup and an intuitive interface. Choose from a wide rangeof transmitter form factors (handheld, bodypack, headworn, lavalier,instrument clip-on) and use it with single- and dual-channel, as well as rack-mounted receivers. RACK MOUNT HARDWARE INCLUDES - 1x rack mount bracket, 1xlong rack mount bracket, 1x link bracket, 1x thread adapter, 2x quarter waveantennas, 2x BNC bulkhead adapters, 1x zippered vinyl bag, 2x 22-inch BNCcables, and 1x hardware kit which contains 8x flat head 6-32 screws to securethe rack ears to the BLX4R, 4x pan head 10-32 screws to secure the BLX4R tothe rack, and 2x plastic plugs to cover the antenna holes in the rack ears.WIRELESS FREQUENCY BAND SELECTION - Before purchasing, please ensure that the wireless frequency band you select works in your area (refer to Shure website for details > search Shure Wireless Frequency Finder).SUPERIOR AUDIO - Get the show going with no strings attached. Professional Shure sound for every band and any vocal need.EXTEND THE STAGE - The system operates up to a range of 300 feet (100m), so you can take the show into the crowd without interruption.QUICK & EASY SETUP - A breeze to setup and operate, BLX will have you up and running in record time.BATTERY LIFE - BLX transmitters get up to 14 hours of power from a single pair of AA batteries, so the show can go on and on (and on).SYSTEM EXPANSION - Run up to 12 Channels per Frequency Band. AKA: you'll probably need to find a bigger stage before you run out of channels.WHAT'S IN THE BOX - BLX4 single-channel receiver, rack mount hardware, power supply, BLX2 handheld wireless transmitter with integrated SM58 vocal microphone capsule, mic clip, 2x AA batteries, and user guide. Free 2-YEAR WARRANTY included.