The sleeve fits really well on the Huawei Ascend G510. All switches and cut-outs are easy to operate. The recess for the on-off switch and for loud and quieter buttons are easy to operate. They are really free and not covered by the Kuststoff, thus optimal operation of keys possible. I find only the plastic is a bit too hard (not soft silicone). But otherwise the cover is really good. I can recommend reassured.