A.O. Smith AC motor. Made for a Liftmaster door opener. Ball bearings. 5/8" x 2-3/4"L v-keyed shaft. 56 frame. 1725 rpm. 115v / 208 - 230v, 1 phase, 14 / 7 amps, 60 Hz, 1 HP. Reversible. Base or face mount. Includes capacitor. P/N: C56B23F21. 6 month warranty.