Viper mini is still living with me, but how long it will live is unknown, because the products are not tested in any way before being sent to store shelves! My viper ultimate squealed, and this mouse hangs, it's inadequate, I've never had so many problems with Chinese brands, and here is a huge corporation! Think a hundred times before contacting their products, do you need all this fuss if it turns out that the mouse is defective?