Shure PS9US Battery Eliminator AC Adapter (for Wireless) Replaces one standard 9V battery, allowing connection to a Shure PS41 AC Adaptor via a threaded DC connector. Use with P2R, P4R, P4HW, T1, T1G, LX1, UT1, ULX1, MX1BP and VP3 PS41 power supply is included