Size is approx. 7.9 by 5.1 by 1cmPassing your finger through the ring makes it easier to hold your smartphone.Since you can attach the carabiner to things like the handle of your bag, it is also convenient for carrying and attaching straps.- We recommend using a smartphone case with a charging cable port width of 10 to 15 mm.- Even with the recommended dimensions, the combination of the smartphone and the case, or the material of the case, may cause it to come out easily.- After attaching this product, please pull the carabiner to ensure that it does not come off easily before use.