GLXD1 is a digital wireless bodypack transmitter from Shure designed for use with GLXD receivers. It delivers 24-bit/48 kHz digital audio with a low-noise, wide dynamic range. The unit uses a TA4F 4-pin input for lavalier or headset mics and is powered by two AA batteries, offering up to 8 hours of operation. Features include microprocessor-based gain control, IR sync, and automatic frequency scanning for interference-free operation.