Shure SLXD3 Plug-On Digital Wireless Transmitter for XLR Microphones, 24-Bit Audio, IR Sync, Secure Lock Ring. H55 Band (SLXD3-H55)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).COMPONENT ONLY: For this SLXD3 plug-on digital wireless transmitter to work, please make sure it matches the frequency band (style) on your SLX-D receiver.VERSATILE XLR ADAPTER - Convert any XLR source for SLX-D wireless systems with +12–48 VDC phantom power for condenser mics and a patented locking mechanism for secure connections.CRYSTAL CLEAR DIGITAL AUDIO - Experience transparent 24-bit digital audio with an extended 20 Hz to 20 kHz frequency range (mic dependent) and a dynamic range of 118 dB.RELIABLE SIGNAL TRANSMISSION - Enjoy reliable signal transmission with digital predictive switching diversity and switchable power levels (1/10/30 mW region- and band-dependent).EASY PAIRING - Pair transmitters and receivers easily through scan and IR sync for hassle-free setup.LONG BATTERY LIFE - Enjoy up to 8 hours of operation on 2 AA batteries or optional rechargeable battery for extended performances.