PLL synthesized frequencies. Two out of three, remotely possible. But not three out of three. The ATW-100 is ruggedly constructed out of metal. The true-diversity receiver is camera mountable.
Short stubbies come standard, but longer antennas are available.
Headphone monitoring, of course. Balanced XLR output connector at the bottom. Audio output level control. Helical filter design improves rejection of unwanted RF signals. Bodypack transmitter is also metal.