Shure GLXD14/B98 Digital Instrument Wireless System with Beta 98H/C Microphone, Z2 Includes: (1) GLXD4 Wireless Receiver, (1) GLXD1 Wireless Bodypack Transmitter, (1) WB98H/C Clip-On Instrument Microphone, (1) PS42US Power Supply, (1) SB902 Rechargeable Lithium-Ion Battery, (1) USB Charge Cable and (1) SBC-USB-MicroB Wall Battery Charger Operate up to 4 compatible systems in typical setting, up to 8 maximum under ideal conditions Best-in-class intelligent lithium-ion battery rechargeability allows up to 16 hours of continuous use and greatly reduces the cost of ownership LINKFREQ Automatic Frequency Management Intelligent frequency management quickly identifies the best open frequencies