Shure QLXD24/B87A-V50 Beta 87A Vocal System Includes Beta 87A, QLXD4, microphone clip, power supply, 2 AA batteries, battery contact cover, two 1/2 wave Antennas, 2 BNC cables, zipper Bag, 2 BNC bulkhead adapters, rack mount kit, and user guide With an interchangeable Beta87A microphone cartridge, the QLXD2/Beta87A is ideal for wireless vocals in presentation spaces, music venues, and houses of worship Half-rack QLXD4 digital wireless receiver quickly Finds open frequencies and deploys them to transmitters via the one-touch sync function Offers up to 9 hours of continuous use with 2 AA Alkaline batteries (included) or up to 10 hours of continuous use with a Shure SB900 lithium-ion rechargeable battery (not included) Ethernet networking enables networked channel scanning and wireless workbench software integration for remote control of receiver settings from Pc/Mac