Easy to use, even though the Samsung S4 slips a little less easily when in its protection that adheres somewhat létui. The control of the smartphone remains easy through the case. The seal can be a problem if we take care to close the 2 seals and clip the flap. For cons, the camera lens is hidden by the case (except perhaps if it comes with a mini camera). I use it to sail a sailboat, and I could swim with no worries seem.