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Unified Battery Charger 3 Bay Rack Set for Polycom SpectraLink NetLink 8030/8020/6020 phone battery, Nortel WLAN 6140/6120 phone battery, AVAYA 3645 / 3641phone battery can charge up to 9 Batteries simultaneously. SK220U3B Unified Battery Charger 3 Bay Rack Set comes with a zCover AC Adapter. This charger will charge the batteries much faster than using other power supplies. The Unified Battery Charger features intelligent battery temperature monitoring and discontinues charging if the battery temperature reaches over 113°F (45°C). When batteries are full, Charger switches to a trickle charge. Unified Dock Rack is part of zCover Unified Modular Docking System. It can hold and power multiple same model or mixed models Unified Desktop Dual Chargers to form a customized Multi-charger. Save desktop space and wall outlet. It is a make sense multi-charger. Unified Dock Rack Set comes with a zCover Global AC Adapter. It is stronger than other multi-Chargers. The Global AC Adapter is certified safe and environmentally compliant, meeting or exceeding regulatory standards.