RND Dock and 2nd Battery Charger for Samsung Galaxy S4 ACTIVE (compatible without or with a slim-fit case) (black) Synchronize and Charge your Samsung Galaxy S4 ACTIVE smartphone with the USB cable. Power Protection Circuit included. Eliminates the hassle of removing your case. Supports majority of Cases. Compatible With: Samsung Galaxy S4 Active | RND Power Solutions products comes in professional retail packaging and offers a 1 year hassle free warranty. Authentic RND Power Solutions products will have our branding on the product and packaging.