UNU Aero Battery Case Cover with Wireless Charging Mat for Galaxy S4 - Black/Silver The ergonomic yet slim style 2600 mAh battery case provides your Samsung Galaxy S4 the true 100% battery boost, equal to an additional 10 hours of talk time. Fully-customizable design with 360 degrees protection offers your premium protection from scratches, fingerprints, smudging and bumps. The intelligent and novel design provides a viable benefit to you, such easy access to all functions, camera, and headphone jack. An Innovative Aero Charging Technology with Certified High Performance Reliability. uNu strict quality control ensures top quality, stylish, and safety for our customers.