Sennheiser EW 100 G4-945-S Highlights For Presenters and Performers MMD 945 Dynamic Supercardioid Capsule Handheld Transmitter with Mute Switch Interchangeable Capsule Design True-Diversity Rackmount Receiver 1840 Auto-Scan Frequencies 8-Hr AA Batteries Expandable to 12 Mic Channels/330' Range Features The Sennheiser EW 100 G4-945-S is an easy-to-set-up rackmount wireless handheld microphone system that brings high-quality, reliable audio to presenters, clergy, lecturers, and performers working in business and educational settings, houses-of-worship, theaters, or on musical stages. The EW 100 G4-945-S features a true diversity, half-rack receiver housed in a rugged, full-metal chassis. The receiver's auto-scan function searches a wide 46 MHz UHF tuning range with 1840 selectable frequencies available, seeking out a clean, interference-free channel for your audio transmission.