This motor controller is made of , which can withstand use. Features the aluminum alloy, PCB and stainless steel material, which has high durability, not easy to deform. Fine workmanship, ensures practicality. Features -Color:Multi -Material:Aluminum alloy, PCB, stainless steel -Size:8.50X5.50X3.80cm/3.34X2.16X1.49in Working voltage: 220V Adjustable voltage: 10-220V Efficiency: over 90% Maximum power: 4000W (resistive load power) Knob inner hole diameter: 6mm - External use of 1.5 thick aluminum plate and stainless steel die stamping. The voltage regulator with housing and fuse is safer, more convenient to install, and more suitable for families and factories and enterprises that are inconvenient to install. - The voltage regulator comes with housing and fuse, safer, more convenient to install, and more suitable for families and factories and enterprises that are inconvenient to install. - Wide ranges of uses: this voltage regulator can be used to control speed, voltage, temperature, and etc. - Note: The fuse is not a , and there is a response time. If the current is too large, in addition to burning out the fuse, the module may also burn out. - Scientific design, high strength, high hardness, and excellent durability, it will easily meet your needs. Package list: 4 x Motor Controller