Audio-Technica ESW-CHG4 ESW 2-Bay Charging StationMake sure your ESW body pack and handheld transmitters (sold separately) are ready when you are with the ESW CHG4 two bay charging station. A rapid recharge feature supplies a full charge to two transmitters in approximately three hours. Up to four charging stations can be linked with an AC adapter and a Cat5 cabling (all sold separately). Conveniently update firmware on all docked transmitters remotely and monitor charging status and battery level