zDock® CI821UDA Desktop Dual Charger Set for the Cisco 8821/8821-EX Wireless IP Phone charges your phone and a spare battery at the same time. It keeps your batteries charged, ensuring that your phone is ready for continuous use over an extended period of time, so you will never have to worry about running out of power again. Not only that, it features our patented Dock-in-Case Solution, which lets you dock your phone with or without the zCover case on. It also gives you full access to the keys and screen so you can keep using it while charging. Complete compliance with environmental and safety standards Come with Magnetic charging connector. Charges phone and spare battey at the same time Designed with our patented Dock-In-Case® solution, allowing you to charge the phone with or without the zCover carrying case Full access to keypad while phone is docked Easy to use: monitor phone charging process on phone screen and battery charging process with 4 LED indicator lights on charger Intelligently directs more power to the phone to charge it first Switches to trickle charge when battery is tested full by battery voltage Safety first:intelligent battery temperature monitord is continues charging when battery temperature reaches 113F(45C) High-powered fast charging delivers twice the output of other power supplies Can be placed on a desk or mounted on the wall to save space Part of the zCover Unified Modular Docking System: can be docked into zCover Unified Dock Racks to form a Multi-Charger and customized by mixing a Multi-Charger with other Unified Desktop Dual Chargers or Unified Multi-Battery Chargers