Installation is very simple and very well done, a small double-sided to paste into the phone receiver. no deformation at the shell fits perfectly. Warning, the charger is supplied without food, just a usb cable (samsung type) of ~ 1m. I got a basic charger (for electronic cigarette), which provided only 500mA (like a USB computer port) and full load is done in ~ 5-6 hours, more than enough to charge at night.