The DC-320 is a 20 battery chargers for Guided Tour hand held or belt style transmitter / receivers mounted in a flight case. The charger is constructed of strong ABS material and has compartments to allow up to 2 hand held transmitters to be inserted into the pre moulded receptacles. Total 20 transmitters can be simultaneously charged. Charging of the batteries will automatically take place and depending on the battery charge state will take up to 10 – 16 hours charge time. For use on NI-MH 1300mAH. 2 red / green coloured indicators are used for each battery compartment giving visual indication of On and charge cycles Switched mode power supply allowing mains power operation 110 – 230VAC .