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, 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.USER-FRIENDLY INTERFACE: The system features a user-friendly interface with easy-to-use controls, allowing users to adjust settings and manage the system with ease.BUILT-IN VERSATILITY - An impressive variety of Shure microphones are available in BLX systems, so you can find the sound that works for you.TRUSTED QUALITY - Engineered by Shure with the durability that set the world standard, it’s sure to keep turning up at legendary performances.