The SBC441 4-Bay Docking Charger supports up to four Axient Digital ADXR Wireless Bodypack Receivers or Shure SB910 rechargeable batteries. The SBC441 includes dual network ports for monitoring and network pass-through. Compatible with both Shure SB910 rechargeable batteries and Axient Digital PSM ADXR bodypack receivers, the SBC441 desktop networked charger is a great addition to your Shure Axient Digital PSM wireless in-ear system.