The Shure SLXD24/B87A H55 Wireless System is perfect for a wide range of applications, from day-long presentations to nighttime performances. It's great for professionals and enthusiasts alike. This system features transparent 24-bit digital audio, an extended 20 Hz to 20 kHz frequency range (microphone dependent), and a 120 dB dynamic range. It has a rugged metal construction for durability. It comes with an SLXD4 single-channel receiver and SLXD2/B87A handheld transmitters with antenna and rackmount accessories and 2 AA batteries. Setup is easy, and you can operate up to 32 compatible systems per 44 MHz band. You can pair transmitters and receivers easily over IR scan and sync. It offers up to 8 hours of use from 2 AA batteries, or you can upgrade to the optional Shure SB903 Lithium-ion rechargeable battery to monitor battery charge status, life, and health statistics. It also has interchangeable microphone capsules.