Tiny ultrasonic fogger is complete with wall adapter. Great experimenter item, produces a nice mist when covered with a thin amount of surface water. See Video. This is not as powerful as a commercial fogger unit, however a small amount of water covering the surface of the piezo transducer will produce a good amount of mist. These are brand new and come with piezo disc that plugs into the main board, plus an AC adapter, 5VDC @ 0.5A, to power it. Size of PC board 1.53" x 1.75". If you want to experiment with a fogger this is a great item, remember this is not heavy duty commercial grade. Bowl shown is for demonstrative purposes only. Great accent for your Halloween display!