1. This propeller must be equipped with a brushless electric adjustment device and a remote controls to function properly. 2. Electronic Speed Controller=Remote Controls:It needs to be equipped with an electronic speed controller.It must be at least 30A It is strictly forbidden to connect directly to the battery. 3.The control of electrical adjustment signals requires PWM signals, which can be controlled by connecting knobs or remote controls 4. Three-phase brushless motor. Insulation and resistance.Nylon propeller 4 leaves. 5. Application: Ship model accessories, underwater robot, remote boat model. Product name: Underwater propeller Voltage: 12-24V Power: 30-300W Motor: 1000KV Specification: CW(Clockwise) Colour:green Material:Stainless steel + aluminum alloy + PLA Package Contents: 1 * Underwater propeller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.