A Thanks for the super fast delivery Fung! This went on from one day to another! Well, taken to Battreiegiff out of the box, after about 1 min. the battery grip was installed on the D3100. What can I say? Simply brilliant! The camera is now "Super" in his hand. Whether I need the additional shutter release .... I can not say so, but I tested it and it works well. I can recommend the battery grip to all owners of a D3100 highly! This is a MUST!