Shure GLXD14 Digital Guitar Wireless System, Z2 Includes: (1) GLXD4 Wireless Receiver, (1) GLXD1 Wireless Bodypack Transmitter, (1) WA302 Instrument Cable, (1) SB902 Rechargeable Lithium-Ion Battery, (1) PS42US Power Supply, (1) USB Charge Cable and (1) Carrying Case 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