The AT8687 Charger Link Kit for ATW-CHG3 and ATW-CHG3N Chargers from Audio-Technica is designed for the 3000 Series UHF Wireless Microphone System (sold separately). The kit can be used to link together an ATW-CHG3 two-bay smart charging dock or an ATW-CH3N networked two-bay smart charging dock for live stage and theater applications.