Description: Product name Use voltage Amps RPM 540K-12T (Z3-Solt锛?/span> 7.4V 5.0 32000 540K-17T (Z3-Solt锛?/span> 7.4V 3.7 24000 540K-22T (Z3-Solt锛?/span> 7.4V 2.7 19000 540K-29T (Z3-Solt锛? 7.4V 1.9 15000 540K-40T (Z3-Solt锛? 7.4V 1.7 12000 Feature: Brightly plated shell, red copper hardware, oil-impregnated bearings be careful:1. Speed 卤10%rpm (tested after running for 1 minute)2. The motor supports up to 12V voltage. It is recommended to use 7.2-7.4V battery3. Motor shaft diameter: 3.17MMThis motor is fully waterproof and can be soaked in water for a long time. But after playing in the water, you need to pay attention to three maintenance points:1. Be sure to maintain the motor bearings with lubricating oil immediately.2. Be sure to dry the water between the copper and the carbon brush as soon as possible and do not wait for it to dry naturally.3. The plugs on the ESC and motor should also be dried as soon as possible.The larger the T number, the greater the torque and the slower the speed.The smaller the T number, the smaller the torque and the faster the speed. Package Included: 1x set