Shure SLXD24+/58 Handheld Wireless System - Includes SLXD4+ Receiver, SLXD2+ Handheld Transmitter with SM58 Capsule, Bluetooth Monitoring, Feedback Reduction, WWB and Mobile App Control, G57 BandPRISTINE 24-BIT SOUND: Hear every detail with crystal-clear audio and a dynamic range exceeding 118 dB, so your voice comes through exactly as intended.ROCK-SOLID WIRELESS: A 138 MHz tuning range and support for up to 14 simultaneous systems means reliable coverage wherever your work takes youEFFORTLESS SETUP & CONTROL: Auto-sync with SLX-D+ gear, adjust frequency and gain remotely via ShowLink, and monitor everything through Wireless Workbench or the WWB Mobile app.SECURE & WORRY-FREE: AES-256 encryption keeps your transmissions private, while rugged all-metal construction stands up to the rigors of professional use.ALL-DAY BATTERY LIFE: Get up to 8 hours on 2 AA batteries (included), or go rechargeable with Shure SB903 Li-ion batteries for even longer sessions.