Lectrosonics IFBT4 - Frequency-Agile Compact IFB Transmitter (Block VHF / 174-216 MHz)The Lectrosonics IFBT4 UHF transmitter was designed for use in broadcast, motion picture, theater, and stage applications where extended operating range and high quality audio are essential. The IFBT4 can be used as a stand alone device or patched directly into popular intercom systems. Features: Digital Hybrid Wireless technology 256 UHF frequencies in 100kHz steps Microprocessor controlled operation 250 mW power output for long range use Pilot tone