When driving the Car Dock keeps your phone charged and in a secure and easy to view position. Signal for both cell phone reception and GPS are optimized when phone is placed inside the windshield area. Drive safe and legal with the charging Vehicle Dock designed specifically for your phone. Play your music and podcasts or stream internet radio apps by connecting to your car speakers with the 3.5mm audio cable. *Requires 3.5mm audio jack input in vehicle. To use place phone it the cradle press the latch downward to lock and plug in the micro-USB connector. The Dock is designed to be compatible with most slim-fit cases simply remove the middle insert. With an open back video can be recorded while driving. Attach to windshield or use the included disc to place on dashboard. A ball-joint connector system allows the driver to adjust to almost any viewing angle. PLEASE NOTE: The cradle will place the phone automatically into Smart Dock Mode. Compatible With: Samsung Galaxy S4 Active