This is a thermal detonator, from the Star Wars saga. Thermal detonators were palm-sized, spherical devices that were used as extremely deadly explosive weapons. In addition to being surprisingly powerful for their size, they could only be deactivated by whomever turned them on. They would only explode when they were activated, and therefore a secure and stable weapon to carry. They could also be programmed to explode after a set amount of time.
It includes the OBJ and FBX rigged so the switch can be turned on and off, and two kind of textures, one of them rusty and the other one clean.