Versatility in a wireless microphone is as important as its ability to deliver clear, crisp audio.The Califone LM319 is designed to work with the entire UHF line of wireless Califone PA systems including: PowerPro™ SD (PA919SD), PowerPro (PA919), PowerPro Companion Speaker (PA919PS), iPod Wireless Portable PA (PA419), PresentationPro™ (PA319) & (PA329), and Wireless Array (PI39) speakers when plugged into the M319 Beltpack Transmitter.This economical mic eliminates the need for dedicated microphones to any given speaker and allows for mix-and-match uses, extends budgets, and provides system-wide flexibility.