3n1 Palm Centro 685 / 690 Premium PDA Smartphone USB Hot Sync Cradle Twin Desktop Charger w/ Spare Battery Slot 3-In-1 Features: Synchronize, Charge Phone and Charge Extra Battery. Synchronize &amp; Charge phone with USB cable. Charge extra battery with AC adapter. The USB cradle holds PDA at a comfortable reading angle and provides convenient access on desk. Portable design &amp; convenient for travelers and business users. USB data cable &amp; ac adapter included