Advanced technology suitable for underwater submersion, outdoor rain, hydropower selection, and underwater equipment. N45H high-performance magnet, high-quality high-temperature resistant copper wire, imported NSK stainless steel bearings, corrosion and rust protection treatment process. First-class waterproof, high efficiency, and energy saving. Vacuum filling: imported from Japan with high-temperature resistance, strong adhesion, oxidation resistance, solidified waterproof glue molding. Waterproof welding: PCB board welding glue curing process, lead glue encapsulation process, first-level and second-level waterproof testing. NSK imported stainless steel bearings: Japan's advanced NSK stainless steel bearings, corrosion-resistant, rust-free. Stainless steel shaft: SUS316 shaft body material, solid solution aging heat treatment process, shaft body Rockwell hardness 58-60. Anodizing process: aluminum alloy housing, anodizing process, fast heat dissipation and lightweight. Color: Black Material: Metal Size: 28.4 * 28.4 * 48.4 mm Package Contents: 1 * Motor 4 * Screws 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 to be slightly different from the real thing. The allowable measurement error is +/- 1-3 cm.