Aroma diffuser having a variable plugging device using an aroma stone

An aroma diffuser, comprising:

• a diffuser including a hollow housing, a heat conduction container, a resistor, and a plugging device, wherein the hollow housing has a first opening and a second opening at opposite ends, respectively, the heat conduction container is received in the hollow housing and has a free end, the resistor is disposed under the heat conduction container, and the plugging device is installed in the second opening of the hollow housing and electrically connected to the resistor;
• and
• an aroma stone disposed in the heat conduction container,
• wherein the resistor, when supplied with power, generates heat, and the heat conduction container conducts the heat to the aroma stone for the aroma stone to diffuse scent,
• wherein the diffuser further comprises a first hooking ring, a second hooking ring, a cover, a first inner annular groove formed in an inner side of the first hooking ring, and a second inner annular groove formed in an inner side of the second hooking ring, the heat conduction container has an outer flange disposed on the free end and having one side hooked to the first inner annular groove of the first hooking ring and the other side hooked to the second inner annular groove of the second hooking ring, and the cover has air vents and covers and fixes outer peripheries of the first hooking ring and the second hooking ring,
• wherein the diffuser further comprises a cylindrical hollow tail cover having a plurality of perforations installed on an outer periphery thereof and a cylindrical pawl having a plurality of hooking components extending downward therefrom, the cylindrical hollow tail cover is received in the second opening of the hollow housing and the cylindrical pawl is installed at one distal end of the cylindrical hollow tail cover, and the plugging device installed on the other distal end of the cylindrical hollow tail cover comprises a USB device, one side of which is combined inside the cylindrical hollow tail cover and with the pawl and electrically connected to the resistor, the USB device having a USB male connector disposed on other side of the plugging device to protrude from the second opening of the hollow housing.