80 x 80 x 25mm (3.15 x 3.15 x 0.98in). Ball bearings, reinforced thermoplastic PBT impeller, class UL94V-0. 5 V, 12 V, and 24 V, 27 CFM to 54 CFM. UL, cUL, CE listed. Auto Start with Locked Rotor Protection. RoHS compliant. Optional Features: Tachometer, Rotation Detection, Life Detection, Over Voltage Protection, PWM, Current Limit Control, Constant Speed.