Lectrosonics

The Lectrosonics Digital Hybrid Wireless® is delivering the superior sound quality of a digital system and the excellent range of an analog system.

IFB

Interruptible Foldback More at Wikipedia …

Transmitter

Lectrosonics Transmitter with Digital Hybrid Technology

Receiver

Digital Hybrid Portable & Rack Mount Receiver

SPDR

Stereo Portable Digital Recorder