Shure SLXD14+/SM35 Wireless System - Includes SLXD4+ Receiver, SLXD1+ Bodypack Transmitter with SM35 Headset Mic, Bluetooth Monitoring, Feedback Reduction, WWB and Mobile App Control, G57 BandPRISTINE 24-BIT SOUND: Enjoy transparent digital audio with a dynamic range exceeding 118 dB, delivering studio-quality clarity you can count on.ROCK-SOLID WIRELESS: A 138 MHz tuning range and support for up to 14 simultaneous systems gives you reliable coverage across any venue or environment.EFFORTLESS SETUP & CONTROL: SLX-D+ receivers and transmitters stay linked automatically, managing interference on their own—plus adjust frequency, gain, and firmware remotely via ShowLink.SECURE & CONNECTED: AES-256 encryption comes pre-installed for peace of mind, and Wireless Workbench or the WWB Mobile app lets you monitor everything via Wi-Fi or Bluetooth.ALL-DAY COMFORT & BATTERY LIFE: Ergonomic, durable design keeps you going through long sessions, with up to 8 hours on 2 AA batteries or optional Shure SB903 rechargeables.