Dimensions: 4.33"L x 4.6"W x 5.78"H Beautiful hand-painted artistry Natural river rocks included Operates on 3V adapter (Included) Can run on 2 AA batteries (not included) In order to address the formation of air bubbles, the motor can be primed by: Turning the unit on and off rapidly 3-5 times Dumping all the existing water out Filling the unit completely with water into the water reservoir in the base Turning the unit on and off rapidly 3-5 times and leave it on