Specification: Condition: 100% Brand new Model: 540 Outer Diameter: Approx. 36mm / 1.4in Total Length: Approx. 57mm / 2.2in(without motor shaft) Motor Shaft Length: Approx. 12mm / 0.5in Diameter: Approx. 3.17mm / 0.1in No Load Current: 1.4A 7.2V Voltage No-Load Speed: 35T 12000rpm, 45T 10000rpm, 55T 8000rpm, speed ±10% rpm (run after 1 minute) The motor supports up to 12V. It is recommended to use 7.2-7.4V battery Optional Style: 35T, 45T, 55T Package List: 1 x 540 Motor Note: It is recommended to use 35T, 45T for big trucks model, and 55T for climbing car model.