The Panasonic WX-SZ600 universal charger can charge any combination of four Panasonic mics and features a network connection for remote monitoring so your IT team doesn't have to run around to physically check all of the rooms at the end of the day in order to ensure the microphones are being charged. This charger can charge up to four WX-ST600 or WX-ST700 units simultaneously. Current WX-ST200 and WX-ST400 models can also be charged. Contactless charging - no metal leads to align. The network function allows the status of each charging slot to be checked remotely using operation software**.