This Shure SLXD14D-H55 Dual Combo System is designed for a wide range of applications. Whether you're giving a day-long presentation or performing at night, it's the perfect choice. It comes with 2 SLXD1 Beltpacks. The system features transparent 24-bit digital audio for great sound quality. It has an extended 20 Hz to 20 kHz frequency range (depending on the microphone) and a 120 dB dynamic range. Setup is easy, and you can operate up to 32 compatible systems per 44 MHz band. Battery life is up to 8 hours with 2 AA batteries or an optional rechargeable battery. The package includes an SLXD4D dual-channel receiver, 2 SLXD1 bodypack transmitters, antenna, rackmount accessories, and 4 AA batteries.