Manufacturers description

PS9 Battery Eliminator
Replaces one standard 9V battery, allowing connection to a Shure PS40 AC Adaptor via a threaded DC connector. Use with P2R, P4R, P4HW, T1, T1G, LX1, UT1, ULX1, MX1BP and VP3. PS40 power supply is included.
Description
SHURE PERSONAL MONITOR SYSTEMS - Accessories
Antennas, antenna accessories, cables and mounting hardware for Shure PSM systems.